That guy is a real badass, he fixed my broken car with his bare hands.

badass 是由 bad（坏的）和 ass（屁股）组成的俚语复合词，字面意思是"坏屁股"。在俚语中用来形容"非常厉害、强硬、不好惹的人"，带有褒义色彩，指那些敢于挑战常规、能力出众的狠角色。