on one's ass

基本解释

What it really means: The process of letting makeup settle on one's face for an extended period of time, making fine lines into skin that would make a baby's ass jealous.
实际上的意思是：脸部定妆的过程（时间超长），使皮肤呈现出优美的线条，其效果让婴儿的嫩屁屁也相形见绌。
"He's a conceited, sociopathic ass whose genius ranges somewhere on the autistic spectrum, but he nevertheless possesses a sense of humor, " according to one review from The Daily Telegraph.
英国《每日电讯报》报道称，“他是个骄傲自负，不善社交的呆瓜；虽然天才使他看上去有点自闭，但他本人仍不乏幽默感。”