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TD means TRUE DAT, which means "true that," meaning the fact is true. It is an expression used in everyday lingo in San Francisco, Walnut Creek, Marin, and Redwood City. It's the new "ooh kill em."
Example 1:

Natasha: that boy is soooo hot!

Tiffany: TD, I'm so D for the D!

Example 2:

Brian: yo I wanna get on dat ass!

Dylan: real talk! TD dude, we should tap that doe
by theTDtruthkoolkats September 25, 2013
Turnt down , opposite of turnt up
Bryan: Did you go to that function last night ?

Erick: Yeah but it was TD !
by xldygotsole June 06, 2010
It means true doe, which means true though.
emily: that kid is so hot!

me: td
by Squaddddddd January 05, 2014
Otherwise known as being trashed > being drunk.

Drunk, under the influence of alcohol. Usually to a large extent. Unable to think correctly, move correctly, or act normaly because of the influence of the alcohol.
Let's get T'd like no tomorrow!
by Vivalaglam February 06, 2010
A popular custom game for War 3
WinterMaul is a popular TD.
by Anonymous September 07, 2003
Trend jumpers. N. (Tee~Dee) Pl.(Tee~Dee's)

(Similar to trend setters)

Shortened to TD's
A noun given to a person or group of people that display the characteristics of conforming. They change their opinions and how they act to follow/copy others through how they act, talk, dress or what their interests are etc.

Td's as the name suggests, jump, from fad to fad or craze to craze. Adopting the latest trends in an attempt to be accepted or fit in. Similar to poser and wannabe
-Hey do you wanna go see *insert popular event eg concert or twilight movie here*? (response) Ew no too many td's.

See also poser
by kwijibo? October 06, 2009
Abbreviation for touchdown in the game of American football. Scored when a player carrying the ball crosses into the end zone or catches a pass while in the end zone of the opposing team. Worth 6 points on the scoreboard.
"He threw 3 TD passes in first game of the season."

"They have already scored a TD on us."

"I can't believe I missed that pass, it would have been a TD for sure if I caught it."
by IceWarm November 21, 2004