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1.
ZT
An abreviation for Zero tolerance.

Often used in rap for it's easily rhymable "tea" ending.

Also happens to be the alias of one badass animator ;)
"Yo, I got ZT for the po-lease. Gotta chill with my homies, huffin on the cold-eze."
by ZT May 11, 2005
 
2.
ZT
Zero tits; flat chested
She's really hot, but a pretty much ZT.
by Van Def June 02, 2005