Japanese has a surprisingly large number of words that refer to the male sexual organ.

English also has several expressions, ranging from the medical and standard term “penis” to slang terms such as “dick.” Japanese, however, has an especially wide variety of expressions, including words used by children, casual slang, vulgar terms, sexually suggestive expressions, and euphemisms that avoid directly naming the body part.

For people learning Japanese, one of the difficult things is that simply looking up a word in a dictionary does not always tell you how vulgar, casual, childish, or sexual the expression sounds in actual conversation.

In this article, we will introduce some common Japanese words for the penis and explain the differences in their nuance and usage.

Keep in mind that many of the expressions below are slang. The standard medical term for the penis in Japanese is “inkei” (陰茎).

Relatively Common Terms

The following expressions are relatively familiar in everyday Japanese, although they are still informal and should not generally be used in formal situations.

Chinchin / Ochinchin

“Chinchin” (ちんちん) is one of the most widely recognized Japanese slang terms for the penis.

It is particularly common in speech involving young children. Adding the honorific-style prefix “o-” creates “ochinchin” (おちんちん), which gives the word an even softer, more child-friendly tone.

For example, a parent might say to a young child:

“Let’s wash your ochinchin.”

The expression itself is not necessarily sexual. In fact, it can sound quite childish or innocent when used with young children.

When adults use “chinchin” among themselves, however, it can sound deliberately childish, humorous, or somewhat silly.

The word can also appear relatively frequently in Japanese manga, anime, and other forms of popular culture.

Even so, it would not normally be appropriate in formal situations.

Chinko

“Chinko” (ちんこ) is another very well-known Japanese slang term for the penis.

Compared with “chinchin,” it generally sounds more direct and crude.

It may appear in jokes or casual conversations between close friends, as well as on the Japanese internet. However, it is not appropriate for formal situations such as business meetings or professional communication.

Depending on the context, “chinko” can be used simply as a slang term, but it can also be used as part of a vulgar joke or to tease someone.

For Japanese learners, it is best to understand “chinko” as a casual and vulgar slang term rather than a word to use freely in everyday conversation.

Chinpo

“Chinpo” (ちんぽ) is another slang term meaning penis.

It is similar to “chinko,” but is often perceived as somewhat more vulgar and sexually charged.

As a result, it is not a word that would normally be used casually in polite conversation.

It can be found in internet discussions, manga, movies, and other forms of media, particularly when the creators want to portray a character as crude, vulgar, or sexually minded.

This illustrates an important point about Japanese slang: understanding a word’s dictionary definition is not enough. You also need to consider who is using it, who they are talking to, and in what situation.

Chinpoko / Pokochin

“Chinpoko” (ちんぽこ) and “pokochin” (ぽこちん) are also informal expressions for the penis.

Like “chinchin,” they can have a childish or humorous tone.

In particular, “pokochin” has a somewhat comical sound and may be used jokingly rather than as a serious sexual expression.

These terms are still informal, however, and would not be appropriate in formal situations.

Terms With Strong Sexual Connotations

The following expressions are more strongly associated with sexual or vulgar language.

Nikubou

“Nikubou” (肉棒) literally means something like “flesh rod” or “meat rod.”

It is a slang expression for the penis and has a strongly sexual connotation.

Unlike “chinchin,” it is not a normal everyday term. It is more likely to appear in adult-oriented content, erotic writing, or sexual discussions online.

Because of its strongly sexual nature, it would generally be inappropriate to use this expression in ordinary conversation.

Mara

“Mara” (マラ) is another word referring to the penis.

It is a relatively old expression and is not particularly common in modern everyday conversation.

The word can nevertheless be encountered in historical or literary contexts, as well as in discussions of Japanese religion, folklore, and traditional culture.

It can also appear in adult-oriented media, where its somewhat old-fashioned or exaggerated sound may be used deliberately.

For modern Japanese learners, “mara” is best understood as a specialized or old-fashioned slang term rather than a normal everyday word.

Sao

“Sao” (サオ) can be written with the kanji “竿,” meaning “pole” or “rod.”

The word is based on the resemblance between a long, thin rod and the male sexual organ.

This is a good example of a common feature of Japanese euphemistic language: instead of directly naming something, speakers may refer to another object based on its shape or characteristics.

“Sao” is not a standard term for the penis and is generally associated with slang or sexual contexts.

Euphemistic and Indirect Terms

Japanese also has expressions that refer to the penis indirectly rather than naming it directly.

These can function as euphemisms, slang, or wordplay.

Chinbou

“Chinbou” (珍棒) is a playful expression referring to the penis.

The pronunciation is reminiscent of “chinpo,” while the use of the kanji “珍”, meaning “rare” or “unusual,” creates a humorous wordplay.

This kind of kanji-based wordplay can be found in Japanese manga, internet culture, and other forms of informal communication.

“Chinbou” is therefore best understood as a joke or slang expression rather than a standard Japanese term.

Ichimotsu

“Ichimotsu” (イチモツ) is a euphemistic expression that can refer to the penis.

The word itself can have meanings unrelated to male anatomy depending on the context. However, expressions such as “otoko no ichimotsu” (“a man’s ichimotsu”) can clearly refer to the penis.

Because it allows the speaker to avoid using a more direct expression, “ichimotsu” may appear in literary writing, old-fashioned language, jokes, or contexts deliberately designed to sound indirect.

Musuko

“Musuko” (ムスコ) normally means “son” in Japanese.

However, expressions such as “a man’s musuko” can be used euphemistically to refer to the penis.

The idea is similar to euphemisms in English, where people sometimes give the penis a different name rather than referring to it directly.

The advantage of this expression is that it can communicate the intended meaning without using an explicitly sexual word.

Context is extremely important, however, because “musuko” normally just means “son.”

Conclusion

Japanese has a surprisingly wide variety of words referring to the penis.

“Chinchin” and “ochinchin” are relatively soft expressions and are especially common when talking to or about young children.

“Chinko” and “chinpo” are more casual and vulgar slang terms, so they should be used carefully.

Expressions such as “nikubou,” “mara,” and “sao” have stronger sexual or vulgar associations and are not suitable for ordinary formal conversation.

There are also indirect expressions such as “chinbou,” “ichimotsu,” and “musuko,” which avoid directly naming the body part by using wordplay, metaphors, or euphemisms.

For foreigners learning Japanese, it is important not to simply memorize the English equivalent of each word. You should also understand its level of formality, degree of vulgarity, childishness, and sexual connotation.

Japanese slang often has subtle differences in nuance that cannot be fully understood from a dictionary definition alone.

Therefore, before using one of these expressions yourself, pay attention to how native speakers use it in actual conversations, movies, manga, or online discussions. Consider who is speaking, who they are speaking to, and what kind of situation they are in.

Words for male anatomy are a particularly good example of how dramatically the tone of Japanese can change depending on vocabulary.

By learning not only the literal meaning of these words but also the cultural background, humor, and euphemistic techniques behind them, you can gain a deeper understanding of how Japanese really works.