【ass不止是屁股】

1. anything displeasing，如：This room smells like ass. 这屋子难闻死了。

2. Someone who doesn't cut you any slack, 如：Terry is really a hard-ass. Terry真是个难缠的家伙。

3. one who behaves in an offensive manner, Jerk, 如：Don't be such an ass. 别这么混蛋好不。