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.

Usually represents a crying face, but most people see it as a disabused face of chillness or skepticism.

the face of glaring
the horizontal lines of T represent the brows
and the vertical lines represent the eyes
the underscore represents the mouth

The face of crying the vertical part being the closed eye and the horizontal line being the line of tears

THIS IS NOT A CRYING FACE

I DONT KNOW WHY PEOPLE THINK THIS IS A CRYING FACE

THE FACE REPRESENTS DISAPPOINTMENT OR ANNOYANCE:

THE HORIZONTAL LINES REPRESENTS EYEBROWS
THE VERTICAL LINES REPRESENTS EYES
THE UNDERSCORE REPRESENTS THE MOUTH

GET IT RIGHT PEOPLE.

Most often used for crying, as the horizontal lines are the eyes and mouth and the vertical lines being the tears, some like me use it when you have your eyes half closed and are generally feeling like you're the only one with common sense.