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1.
thats lame no one does that
like if your friend be like im bout to go to the library and thats unusual you say where they do that at?
de CoaCoa 4 juin 2004
 
2.
A slang term; mostly used in a funny or unusual situation. As if someone where to do or say something lame or unheard of.
EXAMPLE 1:

Dude 1: Yo, tell me how i just saw two big girls fighting over a small ass thong at the mall yesterday?!

Dude 2: haha, eww that's triflin, likee, where they do that at?!

EXAMPLE 2:

Girl 1: ooh, girl. Im badd!

Girl 2: what?? never! its like 85 degrees outside and you wearin uggs, haha, where they do dat at?!?!
de PhillyWrds 17 mars 2010
 
3.
A more ghetto way of "Who does that?" when in a moment of surprise at someones actions
"Did that dude just pick his nose!?"

"Where they do that at!?"
de MagickMissle 4 septembre 2011
 
4.
One of the most stupidest slang terms....used in the case of someone saying something stupid or lame...you reply where they do that at?....its like another way of saying..ur s geek.....or i dnt care..some people just say it to say it..but tis fun to just use to play around with but dnt ever say this in a serious convo....
Dude 1: Ay..where the libary at? i gotta study for this exam..

Dude 2:..*laughs*....man..where they do that at?
de =N' 16 janvier 2010