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1.
The type of dump that makes your pants fit better and makes your legs quiver.
Last night when we got back from KFC I had a thumper dumper!
by Dr. Lipschitz August 26, 2010
 
2.
a person who people thinks does so many good deeds that they should be called "Thumper Dumpers".
"(*woohoo*) well aren't you such a Thumper Dumper!!!!!"
by ADKgirl March 07, 2010