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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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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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