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A rear that is made to look big; either going through plastic surgery or stuffing clothing or other materials to make the butt bigger.
1: danm she got a fat ass!
2: naw man, she got that fake booty two weeks ago.

1: I mean just look at her, she obviously got a fake booty, you can even see the shirt she stuffed inside her pants!
2: holy shit, that is a fake booty
by Amazingdefinitionswithpbr December 21, 2015
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