A sad face used by the internerd herd.
The "TT" are crying eyes and the "A" is an open mouth.
Base in manga.
Kawaii-Neko-Chan: Oh no! I lost all my manga in a fire!
xXMrsSasukeUchihaxx: NOESS! TTATT
Taco Tuesday at Taco Time a.k.a. the best thing in the world.
Time: 11:15/Tuesday morning
konga loser: What you doing for lunch today?
TTATT-King: Umm what do you think dude? Eating some fucking Kirkwrap supremes at Taco Time, get tha fuck out of here.
Devo: Uh, Mr. Cawood, it's Tuesday.