What is Ttd?
1.
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.
See
2.
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.
TTD
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3.
Textually Transmitted Disease. When you recieve or send a virus via text message.
Mark: Dude, I think I just got a virus on my phone.
Kenyon: Thats sucks. It was probably a TTD!
See