gnarwomp Share definition Flag an expression used when something bad happens or when you're in a bad mood. can result from a gnarly situation. Jon- "Did you see that surfer's wipeout? He totally hit the reef."Kim- "Gnarwomp. . . " gnarwomp by surfingthedream March 7, 2011 0 0 Get merch Get the gnarwomp mug. Buy Now — $32.95 See more merch