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Gnar-Tard is a combination of the words Gnarly and Retard.

It is used to describe someone who is truly and idiot.
You are such a Gnar-Tard!
by Girlygirl3423232 June 14, 2009
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1. A person famous only for doing moderate to extremely dangerous stunts that most would consider not ONLY dangerous, but quite stupid.

2. A person with an obviously low IQ that over uses clichΓ© surfer language and mannerisms.
I can't believe Jake is so popular for jumping over that car, he's such a gnartard.
by ChaosAxis February 22, 2011
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