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1.
TYAT stands for Think Your All Tuff. It can be used to describe a girl or guy that thinks they are way too tuff or cool and really are not, along the same lines as a poser. JJ is credited with this word but it has been blown up all over mv
p1:Jeff is SOO TYAT
p2:ya he is....how weak
by MvHyphy June 12, 2006
 
2.
Redneck Slang for breasts
1. "Lets go to the Stripclub and see some tyats!"

2. "Going to go home and watch some tyats on my new Teevee"
by blairblack January 19, 2010
 
3.
that you are or are like an uncontrolable laughing sickness or some sort of stupid thing. it's commonly refrered to as extremely weird or stupidly idiotic, or an act of that kind.
This example is soooo TYAT. or: That person is a TYAT. or: That monkey has TYAT (not that a monkey would get TYAT).
by Leah C. July 05, 2006