chinko チンコ, chinpo チンポ (Vulgar, Sex-Related Term)

In Japanese, chinko チンコ means "penis," but it's a vulgar word, so its closer to "dick" instead. Like some other terms for body parts, it can get the o- お～ polite prefix attached to it: ochinko おチンコ. It's also spelled ちんこ, おちんこ. It's also romanized tinko.

Anime: Africa no Salaryman, アフリカのサラリーマン (Episode 1)

• Context: a common "dirty joke," shimoneta 下ネタ.
• pachinko
  パチンコ
  A gambling game similar to pinball.
• If you remove the pa パ from pachinko, you get chinko, "penis."

A less vulgar, childish variant is chinchin ちんちん, or ochinchin おちんちん. The technical term for "penis" is inkei 陰茎.

The female counterpart would be manko マンコ.

• チンポ
• Portmanteaus
• References

チンポ

The word chinpo チンポ means the same thing as chinko チンコ, it's just another vulgar word for "penis." It even has the same variants: chinpo ちんぽ, ochinpo おチンポ, おちんぽ.

If there's any difference between chinko and chinpo, it's that chinko is more common and chinpo is more obscene. So it's basically the same thing as the difference between "dick" and "cock" in English.^{(detail.chiebukuro.yahoo.co.jp)}

There are also other variants meaning more or less the same thing, like:

• chinbou ちんぼう
• chinpou ちんぽう
• chinboko ちんぼこ
• chinpoko ちんぽこ
• chinpokko ちんぼっこ

Portmanteaus

There's a dozen of slangs involving penises that include the morpheme chin チン, an abbreviation of either chinko or chinpo—doesn't really matter which—in them. For reference:

• furuchin
  フルチン
  "Full penis."
  • A man who's fully naked. Even his trousers are gone.
• yokochin
  ヨコチン
  "Horizontal penis."
  • A penis that's visibly "horizontal," yoko 横. In the sense it's either exposed, sticking out the shorts from one of the leg openings, or that makes a horizontal bulge in the pants.
• yarichin
  ヤリチン
  "Doing penis."
  • From the verb yaru やる, which means a dozen of things, but in this case specifically it means "to have sex." This term refers to someone who (or rather, whose penis) has a lot of sex. Someone promiscuous.
• dekachin
  デカチン
  "Big penis."
  • Literally. From dekai デカい, "big."
• sochin
  粗チン
  "Shabby penis."
  • A small penis. From somatsu 粗末, "shabby," in the same sense as soshina 粗品, "inferior goods."
• chinge
  ちん毛
  "Penis hair."
  • In technical words, "pubic hair," inmou 陰毛.
• chinkasu
  チンカス
  "Penis waste."
  • From kasu 滓, which means Kazuma something worthless, waste, scum, etc. This is a colloquialism for "smegma," chikou 恥垢.
• chinchira
  チンチラ
  Chinchilla. A genus of rodent.
  • Wait a minute, this isn't a penis!
  • Okay, it could also be "penis glimpse," a type of chiralism, like panchira パンチラ.

References

• チンコとチンポの違いは何ですか？ - detail.chiebukuro.yahoo.co.jp, accessed 2019-04-28.