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1.
One of the lead characters in one of film's proudest moments, Wayne's World. And also appearing in the slightly less proud moment, Wayne's World 2.

Dana Carvey played Garth in both the two movies and the Saturday Night Live skits which launched them. He's a pretty radical dude with long hair, sick shades, and can headbang like no other. Idol to some, but hero to all.
"Man, let's go have premarital sex and snort coke!"
"Wait... what would Garth Algar do?"
*thinks profoundly*
by Nathan Clark Miller May 07, 2007
 
2.
Refers to "Garth Algar" from waynes world.

When someone does something so radical and awesume
Dude, that was so Garth Algar!
by Slintbug December 11, 2004