also: きじるし · キジルシ
Stop acting like a madman.
Most common spelling; uses katakana キ to emphasize the slangy, euphemistic nature.
Kanji spelling using 気; less common but still encountered.
Mixed kana-kanji spelling; less common.
All-katakana spelling, sometimes used for emphasis or in informal writing.
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.