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What is Thunder Pump?
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: ....
Thunder Pump - video
Thunder Pump - what is it?
To hump someone as hard as you possibly can.
Mate, I thunder pumped that girl all night long!