蟻ありの門と渡わたり

expression, noun

very narrow passage; tight squeeze

Literally 'ant's gate crossing'; used for a passage so narrow one must edge through sideways. Often humorous or exaggerated.

• この路ろ地じは蟻ありの門と渡わたりで、太ふとった人ひとは通とおれない。

  This alley is a very narrow passage; a fat person couldn't get through.

expression, noun

perineum; taint

Euphemistic slang for the perineum, likening it to a narrow passage. Vulgar in tone; use with caution.

See also: 会陰

• 彼かれは下しもネタで「蟻ありの門と渡わたり」という言こと葉ばを使つかった。

  He used the word 'ari no towatari' in a dirty joke.