Dude...Not Cool 

1# Grossly insenstive, blantant lack of consideration or forethought; social ineptitude.

2# One who is on the verge of being deemed a stark, raving asshole.

DUDE: uh, I know invited you out for dinner, but I uh...left my wallet at home.
CHICK: Can you pay me later tonight?
DUDE: uh...not all of it, I just paid rent...but at least 10 or 15 bucks...does that mean you're staying over?
CHICK: Dude...Not Cool.

Dude...Not Cool by 415man94102 June 4, 2014

dudenotcoolman 

1. expression to say dude thats not cool man
2. the best gamertag for xbox live ever

1. dudenotcoolman u smell
2. man dudenotcoolman is pro at call of duty 4

dudenotcoolman by dudenotcoolman January 3, 2009