ur cool Posted in U Best definition ur cool a phrase you say to someone who in fact isnât cool or funny, but is annoying. Reid : âguess what? my moms getting me gucci slides! suck on that losers!â Hannah: âoh wow ur cool.â How satisfied are you with the definition? Looking for ur cool meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 55 times.