ケツマンコ

noun

anus; asshole; arsehole

Vulgar slang term for the anus. Strongly offensive; used in crude or insulting contexts.

See also: まんこ

• あいつ、マジでケツマンコがゆるいんじゃね？

  That guy's asshole is seriously loose, isn't it?

• そんなこと言いうとケツマンコに指ゆび突つっ込こむぞ。

  Say that again and I'll stick a finger up your asshole.