Top Definition
(hi·lar'i·ass)1: a. Of or characterizing something of such extreme hilarity that it jiggles one's ass cheeks from laughing so severely. b. Or such extreme hilarity that people wish to use the term 'laughing their ass off' in short as hilariass.
That joke was so f-ing hilariass!
by Timothy Bucci May 10, 2007

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