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1.
Where a person did something completely out of the ordinary.
That's unfrigginbelievable, he made you spew all over him.
by Unfrigginbelievable November 07, 2010
 
2.
When you are struck by awe and utterly speechless.
That was UnFrigginBelievable!!!
by ixUNFRIGGINBELIEVABLExi April 01, 2011