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Thunder Pump

To hump someone as hard as you possibly can.
Mate, I thunder pumped that girl all night long!
by Johnny Bad May 25, 2008
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Thunder-pumping

The act of vigorous masturbation, but only when it is so violent that anyone who hears it, assumes they are hearing rumpy-pumpy.
Person 1: I was totally thunder-pumping to your mom's Facebook last night
Person 2: ....
by JBizzle89 November 12, 2012
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