Tay is the short-form of TayTay.
Tay is a gentleman with a ferociosly large penis, who is very charming with the ladies due to his sizeable endowment.
Can be used as a noun, or a verb.
Dude! You are such a Tay!
Man, did you see the way Renfro was mackin those girls? He was Taying it up like it was his job.