When your spooning with your partner, the person in front farts, resulting in rumbling of the balls.
"babe! you just gave me Rumble balls!"
by RumblerT September 04, 2011
1- A playful term for being a horny male

2- A silly but harmless twit
I've got a bad case of the rumbleballs!

Aw, don't pay attention to rumbleballs over there; he's just being being an ass.
by Batrastard April 21, 2003

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