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....

Let me die.

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

Occasionally people will respond with this emote to some of your more precariously aimed remarks.

Is translated to and can be interpreted as a thanking; thank you.
More Ts can be added by the other person to extend or increase the amount of thanking that you receive.
Replying with "yw" is perfectly appropriate.

putting up your middle finger or a way to say i dont care