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1.
One who endorses guns, and preserving the legalization of domestic ordnance.
"I am pro-gun. ^_^ Anti-gun wussies can kiss my ass."
-me
by Dave June 22, 2004
 
2.
Noun -
1) A gun in an online game which can be considered professional, or a gun used widely by professional gamer
-or-
2) Something or someone that is so good, it/they could be paid
1) The AK-47 in COD4 is progun

2) Wow, that guy is a totally progun sprinter
by PFSOM May 04, 2009