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1.
TDA
London police jargon for "Taking and Driving Away" aka stealing a car/automobile.
Dizzee Rascal: "Go ahead check my files all day/Bit of criminal damage and T-D-A/Might be a little bit of violent disorder/But I aint never been locked away"
by Task3G November 30, 2004
 
2.
TDA
Twitter Display Of Affection

When two people that you follow on twitter will not even try to hide their ~love for one another, causing you, and everyone that is following them to have the urge to yell "HAVE YOU NEVER HEARD OF DIRECT MESSAGES, GOOD LORD."
@skaterboy101 i love you bb, you're so far away!
@skatergirl102 oooh baby, i miss you too. TWO MORE HOURS, BB AND WE WILL BE TOGETHER.

skateboy101 i miss you, i need you in my arms; together we are INVINCIBLE
skateboy101 even though we're miles, and miles apart, you're still holding on to my heart; promise it'll never be dark, i know we're inseparable

--someone logs onto twitter, and sees this blasphemy--

"What the fuck, can they STOP with the TDA, jesus christ this is unbearable."
by clumsyheart June 28, 2009
 
3.
TDA
Terminal Drag Ass - lazy, asleep on the job, tired, lethargic, slacker

Antonyms diligent, energetic, hard-working, industrious, lively
He had such a bad case of TDA he hardly did any work.
by Aard Lee February 11, 2013
 
4.
TDA
The Dark Age (TDA) is a highly adictive MMORPG for all ages. Based off the MMORPG called tibia, TDA is working to make its self a true one of the kind MMO. TDA is also often mistaken for OTserv, a Tibia emulator thats been around for manny years.
TDA, not an OTserv server
by DeathfireD December 22, 2005