A game in which two men (not gay) jerk each other off vigorously until one blows his load. After the winner may choose to call the guy a faggot and blow his load onto his face.
Dude me and gouch were playing Spank Ze Monkey yesterday and i totally fucking lost! He blew his load onto my eye and called me a faggot, humiliating as shit.
Originally coined by Liam O'Brien of the Critical Role D&D ensemble, and subsequently (maybe) made canon by DM Matt Mercer's explanation that summoning the monkey is the past time of many a wizard in their early years of training.
Sam: Have you seen Liam?
Laura: He's in the bathroom, probably summoning the monkey.
Sam: Thanks, I think I'll join him.