Top Definition
When something really bad happens. Comes from suck and in this case it is sucking something big and fat. Used in the worst of situations when not much else can be said.
Doctor: I'm sorry, but you only have a few more months to live.
Man: Damn. That sucks a fat one.
door Anonymous 10 april 2004
Used as an insult.

Equivalent to telling someone to fuck off.
Damn you're a douche bag. Go suck a fat one.
door Truuuuu 21 juni 2014

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