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1.
A one-eyed mammal bred to serve under Mental's Horde. A relatively common enemy in the Serious Sam series, and rather easy to kill due to its lack of oversized ordnance.
"It's all fun and games until someone loses an eye" - Sam Stone after killing a Gnaar.
by Flash Dude November 23, 2011
 
2.
i word that everyone should use to fill awkward silences or just in random conversation
person:... and like ya

awkward silence

me: gnaar
by iamthewalrus123 July 14, 2010
 
3.
a word to express urself when being in a really dry mood!
person 1: het u want another can?
Person 2: GNAAR
by Lance Weber February 17, 2008