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2.
A combination of two words, namely "what's" and "that".

A lazy, slang way to ask the question "What's that?"
Boy 1: "Hey did you hear about Daz and Sarah gettin' nakie in the club last week?"

Boy 2: "Wassat?"

Anatomist: "So I was studying the Hyopglossal nerve today and discovered it wasn't as close to the ansa cervicalis as I had previously thought."

Uneducated person: "Wassat?"

Pervert: "I bought a whiz bang sex machine with double pop rivets today."

Naive person: "Wassat?"
by catastridphe July 17, 2006

Words related to wassat

students t.v. wazzat wha whazzat
 
1.
stands for "what's that"
Wassat you say?
by Aaron W. February 20, 2003