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You feel a surprise come from your a hole (you farted) and it rumbles your nut sac and everything inside your nut sac.

The action of the fart or gas (queef if your a fag), rumbles (shakes or moves) your gens (balls).
Yo dude I just had a "gens rumbler". You smell that?

Oh shit man you smell that, you been rumblin those gens or what???

Drew: Gens Rummmmmbler!

Walt: Fuck you man (He gets off the couch and leaves the room)
by Whale Dick May 05, 2009

Words related to Gens Rumbler

fart gas gens rumber gens rumbla genz rumbler