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1.
The act of using a toilet plunger to unclog an asshole that has been stopped up with feces and food particles.
After swallowing too many pieces of gum, Kristen decided it was best to visit the doctor to get a butt plunge.
by Static1432 October 23, 2009
 
2.
Another way to explain Anal sex.
look at that hot girl!
Damn man, i want to Butt-Plunge her
by SuckMyBigItalianCock November 25, 2010