is a way to describe something utterly amazing, cool, and something that rarely happens/something that is once in a life time.
"yo that roller coaster was sick"
-"yeah it's like sex on a cloud"
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A F.U.B. is a Fat Ugly Bitch
"yoooo, your sister is a F.U.B."
-"What?"
"Your sis i a fat ugly bitch"
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