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

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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