also: きじるし · キジルシ
noun
Slang, euphemistic term for a mentally unstable person or madness, derived from 気違い (きちがい) by replacing 違い with the symbol 印. Considered sensitive; use with caution.
See also: 気違い
あの人はちょっとキ印が入ってるんじゃないか。
Isn't that person a bit touched in the head?
キ印みたいな行動はやめてくれ。
Stop acting like a madman.
Direct, offensive term for 'madman' or 'lunatic'. キ印 is a euphemistic, slangy replacement that softens the word by using the symbol 印 instead of 違い.
Slang coinage from 気違い (きちがい, 'madman') by replacing 違い with the character 印 (しるし, 'mark/symbol'), creating a euphemistic and less direct expression.