Definition (身体)
A vulgar way to refer to you or yourself, him or himself, me or myself, etc.
你屁股（粗俗用语）
Get your ass into my office right now!
立刻给我滚进办公室！
I should sue his ass for slander.
我应该告他诽谤。
She'd better get her ass over here quickly, or she'll be in trouble!
她最好赶快过来，否则她会有麻烦！