Top Definition
to jack off and take a shit at the same time. Double the pleasure, double the fun.
I was feeling very horny but had to take a shit so why not kill 2 birds with one stone and pump a dump?
by ohnobo August 10, 2009
The desire to partake in anal fornication.
Man- "Aww that chicks hot!"

Me- "Yeah I'd like to pump that dump...all day pump a dump."
by Tha bratz October 05, 2010
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