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2.
An abbreviation used to say a girl one has seen has a "tight ass", which helps guys talk about girls they see without creeping people out.
"Yo Evan, that girl that just walked by, she's got T'ass, man, you can't deny that."
by Orsche December 03, 2009
 
1.
Cool. Hip. Not at all square. (The term originated with the video game "Tass Times in Tonetown", and derives from "Veritas" (Truth) in the Harvard slogan.)
That is one tass hooplet, Chaz!
by JLBGeek August 28, 2005
 
3.
To play with or to fondle
What's BJ tassin' with?
by Marx323 November 09, 2007