Top Definition
when a girl has a huge butt that looks like an old grannie's
man, is it me? or does alyssa have grandma booty?
A woman with a flat, or frog butt
Guy 1: That woman looks so gross from behind.
Guy 2: That's because she has a grandma booty, eeffing nasty!
by nbunch81 June 03, 2016
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