ha-bunk-a-dunk
A big ol' chunk of meat on your backside that makes you look like you just ate a whole pizza and then tried to dance in a clown suit. It can be cool or it can be annoying depending on who's watching.
My aunt has a ha-bunk-a-dunk so big it makes the whole family look like they're doing the limbo.
He showed off his ha-bunk-a-dunk at the party and everyone laughed at him like he was a fat kid in a tutu.
I told my mom she had a ha-bunk-a-dunk and she yelled at me like I called her a pig.