noun
Slang abbreviation of 刑務所 (けいむしょ). Used in casual, often rough or criminal contexts, similar to English 'slammer' or 'pen'.
See also: 刑務所
あいつ、ムショから出てきたばかりだぜ。
That guy just got out of the slammer.
ムショにぶち込まれた。
I got thrown in the pen.
Slang abbreviation of 刑務所 (けいむしょ), dropping the first character and using the on'yomi reading of the remaining two.