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A good fucking or high level of sexual activity. Not as high a level as a G5 uber fuck. Can also be said as just G4
Dude dont' even go for a G4, she's just a tub of lard.

I'm gona G4 the slut in our grade tomarrow.
by alex April 04, 2005
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Oct 30 Word of the Day
A trick played on a fellow athlete where the open hand smacks the target's testicles with the knuckles in a sharp, wrist flicking motion.
"Dude, I sack tapped Brandon, and now he has the whole team trying to sack tap me"
by Chris M July 07, 2004
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