g4p

"Gay for Pay"

when a straight person (usually male) with no true homosexual tendencies or curiosities acts in a m2m or similar gay porn. He is doing it for the money

Marcus: "Dude, did you see that gay porn Andy had on last night?"

Kim: "Yeah. Didn't that guy look like Luke, from school?"

Marcus: "It WAS Luke!"
Kim: "I didn't know Luke was gay!"
Marcus: "Well, he's not really gay. He's g4p. Gay for Pay. I heard he made $5,000 for that movie!"