Why do Americans add a meaningless "ass" onto words?

Like "badass", for example? What does it have to do with their bottoms?

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WhateverWorks · 36-40

🤔😆 it’s a good question. I’m pretty sure the ass is referring to donkeys, not butts, but I’m still not sure why we do it.

BijouPleasurette · 36-40, F

@WhateverWorks You mean "badass" means "bad donkey"? I don't think so. Lol :)