The face you use while crying. Often used in AIM chats and emos

the face of crying
the horizontal lines of T represents the eyes
and the vertical lines represents tear
the _ represents the mouth

can be use with multple T(in even numbers):
TT_TT
TTTT_TTTT....

Dismayed or displeased; aggravated.

(What is "T_T"?)

An emoticon that describes and shows facial expressions.
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(What does "T_T" mean anyway?)

This emoticon is mainly to describe that someone feels or is sad, desperate, doomed, or in any type of other emotional situation.

(What do the Symbols stand for?)

It is supposed to be seen as a crying face, sometimes, it is seen as annoyed face with the two T's subtituting as eyes.

The slits (top part of the T) in the emoticon stand as for the eyes being closed, and the other part of the T stands for teardrops pouring out of the eyes. The underscore, ( _ ) is the mouth.

(Extras)
Apostrophes can be used as sweat, or viens popping out too:
T_T'

T_T] (On the phone)

=T_T= (Crying kitty or Anime Face Expression)

T_\\ (Emo)

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The clan tag of a popular Team Fortress 2 clan, the Turnip Troopers.

t_t is someone flicking you off, see how it looks like two hands... also it is not to be confused with T_T which is a crying face.