Top Definition
A term used to define something as both totally amazing and completely unbeleivable. (Particularly used at extreme sporting events)
Dude, did you jst see that 1080 backflip, over those 20 buses? It was gnarl-donkulous!
by OMG!Art September 11, 2012

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×