Japanese dictionary
けつをまくる
to suddenly assume an antagonistic attitude; to suddenly become defiant; to turn aggressive (in one's manner)
Kanji details
・buttocks
・hips
・butt
・rear
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to moon;to point one's naked buttocks at someone;to give someone the brown-eye
しりをまくる
to suddenly assume an antagonistic attitude;to suddenly become defiant;to turn aggressive (in one's manner)