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1 definition by ugk

 
1.
(noun) Along with being a term for the actual gravity bong itself, it can also refer to the overall process of using a gravity-assisted smoking device, including but not limited to the smoke produced
"Holy shit, Jane just took that entire grav to the face!"

"Fuck it, let's not watch the Clippers, let's go home and do gravs and play Sega Genesis."

"Eww dude, you got resin on your teeth from that huge grav, gross."
by ugk May 30, 2008