Top Definition
To emphisise how good something is. It is used when something is better then the best.

Comes from the word 'unbelievable'

Commonly used in Geelong, Australia
David: Dude, did you see that chick, she was unbeleavzz

Luke: Nah dude, shes flipt

Ben: Luke, she was pretty unbeleavzz
by _shack_ February 21, 2013

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