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This occurs when fat people wear pants a little to tight, and a hot dog bun-like mass forms at the bottom of the ass, much like a second, smaller ass.
Mikey: Look at that fat lady's rear, there's like a tiny little ass at the bottom!
Negin: It's called a Blubber Bun, Mikey, get it right.
by BeauNWO June 20, 2011
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