Y.A.S.

Y - You
A - Ain't
S - Shit
Made popular by Trey Songz's song Y.A.S. on his album Trigga

Girl: Oh, so you thought you were the man, I have another man buying me all these bags Y.A.S. (You Ain't Shit) nigga

by JssJonez July 18, 2014

Y.A.S

This stands for you ain't shit.

John texted me this "Y.A.S" after i cheated on him with his best friend.

by Chicken&waffles December 18, 2016