look up any word, like cleveland steamer:
 
1.
UAD
Ugly Ass Dude
Look at that UAD.
What's an UAD?
Ugly Ass Dude.
by aloe2oeld January 16, 2012
 
2.
UAD
Acronym for Uncontrollable Appetite Disorder. A disorder associated with very large people.
Mr. Allen has a UAD, we really should respect his disorder.
by Captain Duder July 09, 2009