Textually Transmitted Disease. Also known as memes. On-line quizzes and surveys and other like things that people either post to their pages or e-mail to their friends, so that all their readers and friends may do the exact same thing in turn.
Examples of TTDs can be found here: http://www.blogthings.com/
by assassinscloak October 06, 2008
Stands for "This Thread Delivers". If while surfing the internet, you come across a thread or forum topic that has some decent porn, to the fact where you actually get off from it, you can let the world know by simply saying TTD.
Oh man...I can't believe all the pics of what that chick just did.

by BTmoney June 17, 2007
Take The Dick
Damnnn that girl is mighty fine, she can TTD!

i heard she can TTD like a champ
by picking my nose February 28, 2011
I got TTD, or things-to-do anyways.
by asfd777 August 20, 2012
Trying to Date
Look at Chris over there, he has been TTD Jill all night
by Bowgitty February 04, 2010
Tweleve Thirty Dead
It's what you people who work at fast food restaraunts call the time when you have no customers (dead) but this always happens at 12:30 and there are no customers!
Mark: Well Shar, looks like the ttd has come.
Shar: it's the ttd!
by Meowcow69 October 29, 2009
TTD (Temperament Trending Downward)

Where -- quality of mind, mood, sensitivity, nature, disposition, outlook or character begins to or becomes: calm, serene, composed, unruffled, nonchalant or imperturbable.
As the speaker increased my anger I quickly viewed my phone nature pic’s causing my TTD to reach a tolerable level.
by crustyman June 10, 2010

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