What a CONCEITED and heedless ass!

多么自负和粗心的蠢驴！

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He insists that firms must use their patents or lose them, "You can't just sit on your ass and give everyone the finger."

他坚称，公司必须使用他们的专利，否则将会失去他们：“你不能只自己坐下然后对别人指手画脚。”

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I jumped back and fell on my ass.

我往后一跳，摔了个屁股墩。

《柯林斯英汉双解大词典》

After this initial foray into the mainstream, Heacock observes that usage of "kick ass", "kicking ass" and "kick-ass" picked up even more frequently from roughly the year 1990 onwards.

BBC: Kentucky 'kicks ass': Taking pride in plain speaking

Their ranks include Christopher Nolan, of The Dark Knight and Inception fame, and Matthew Vaughn, director of Kick-Ass and the upcoming X-Men: First Class.

BBC: Killer role for Atonement star Ronan

Apple is taking that supposedly wasted cash hoard and kicking serious ass while the rest of the computer industry sits around sucking its thumb and starts complaining about big, bad Apple cleaning up components and shutting them out.

FORBES: Apple Flashes Cash As Japan Supply Chain Woes Continue