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1.
It's a butt that is is very big and attractive were you wanna hit it. Like in bumper cars you wanna hit the other people.
My boyfriend has a bumper butt
dodane przez Gpnfa lipiec 10, 2014
 
2.
A game played while on the bus whereby two (or more) people repeatedly touch butts (tap ass, moon landing, etc).
"Wow that was an exhilterating game of bumper butts! I feel like I owe you a drink!"
dodane przez gjcourt listopad 09, 2012