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1.
A portmanteau of the words, "Gnarly," and "Fart."

intr. v. (gnarted, gnarting, gnarts) To expel smelly or awful sounding farts.

n. A thunderous and or rank fart.
Prior to my Super Bowel I had a the worst gnarts.

Jeffs gnart cleared the living room.
by RedBathTub February 07, 2011
 
2.
Synonym for dang
Oh gnarts I forgot my phone in my car.
by meep&cluck July 23, 2012