The act of fucking somebody, and in doing so making them gay. This can be done to and by all genders. The female version is"fuck 'er gay" and the male is "fuck 'im gay", "fuck 'em gay"is used in all other situations.
Example one:
Bob: Jane just broke up with me
Tom: why?
Bob: I fucked 'er gay
Example two:
Tim: I got a new boyfriend
Jim: how?
Tim: I fucked 'im gay
Jim: wait, you're gay?
Example three:
Dave: I'm going to have a threesome tonight
Steve: I feel sorry for the girls
Dave: why
Steve: you're probably going to fuck 'em gay
Rolling on the floor laughing so hard i turded
God dude, don't make me ROFLSHIT