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1.
A fake compliment said in a condescending tone of voice. A sarcastic comment that translates to you suck.
Loser: Oh no I just crashed my car
Jackass: YOU'RE COOL.
by dilary huff December 28, 2005
 
2.
sacastic way of telling someone that they dont care and to stop bragging about something they did.
girl: OMG i was so drunk last night! and i fucked some random guy haha i wassss soooooooo fucked!"
boy: YOU'RE COOL!
by chanelbabycakes March 07, 2010
 
3.
What you say when somebody has to ensure their "coolness". It has to be done in a sarcastic tone, or else the effect isn't achieved.
1: Dude, do you have the homework? I fell asleep last night
2: Nah man, I don't do homework, that shit is fucking nerdy
1: Oh you're cool.
by dat assases May 01, 2009