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1.
To gyrate ones testicles while copulating
Last night I was totally powerballing your mom.
by thadude October 10, 2006
 
2.
When your fucking a chick so hard, your balls go in the chicks ass.
guy: dude, i was power balling my girlfriend last night and my balls still swollen

friend: dude, no way. i hope you put ice on that shit. it takes forever to get the swelling down
by iamjimmypage April 17, 2008