尻しり肉にく

noun

rump; butt flesh

Colloquial term for the flesh of the buttocks, often used in casual or humorous contexts.

• 彼かれは椅い子すから立たち上あがるとき、尻しり肉にくが痛いたいと言いった。

  When he stood up from the chair, he said his butt flesh hurt.