look up any word, like half chub:
 
1.
A banging headache usually achieved by hitting your head on the floor during an extream sport.
Holy shit dude I've had the worst gnar jar every since I ate shit on that front side lip slide on the 10 set.
by iDa Guzman of bexley June 26, 2011
 
2.
a gay trick or another word for bop
one day at the skate park kyle says tht girl is a bop then i say im gonna make a another word for it so i use the gay trick gnar jar to call them tht
by joe mulqueen August 09, 2006