1) a way of harmless roaring at someone online without scaring them, rather making them laugh or 2) when pronounced out loud it's used to convey the lack of intelligence you yourself has, especially when used randomly and/or for no reason at all.
person 1: nice fupa buddy, rarg!
person 2: (?) are you retarted?

--or online--

aim_guy: rarg, RARG!!!
aim_girl: whoa, i was scared at first, but now realize that you're just being silly.... you're dumb.
by iamcalledpooky June 17, 2005
The war cry of the main character in Quake 1, used by some Online FPS players trying to stick to old traditions.
1337f4g: Im coming for you, I know your in there.

Oldskool: bring it, RARG!
by Anonymous September 18, 2003

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