2)big waves, surfer slang- derives from gnarly
1) Wading in the virgin river in Zion Nat. Park, Mr. T said "boys, im up to my nar-nars!"
2) Surfer 1: Dude look at those nar-nars!
Surfer 2: Brah, i know! those are some pretty sweet waves!
Tourist: Shut up or i'll kick you in the nar-nars