Means Tap That Ass.
As Said By Ludacris In His New Song "Sexting."

Abbreviate for "text the address"

Twerk that ass

Abbreviation for "tend to agree," or "I would tend to agree." Used primarily as a lazy way to say "I would tend to agree," or in online instant messaging.

Tight Teen Ass

This topic again. Used in forums where people continue to make the same topic over and over again.

abbreviation for tap-that-ass