To be Fucking Retarded, or a Fucking Retard.
God that guy is FUCKTARDED!
Fuck you FUCKTARD!
Or for all you prudes out there... To act extremely stupid...
To "chill the fuck out" and relax at the same time, usually with friends
Dudes, we should all go back to my place, have a beer, watch TV and fuckin' CHILLAX!