Its when your deep throating a chick, and as your about to cum, you dump a bucket of ice water to make her take all your jizz in her lungs
Dude I'm gonna Nirvana Chicken this bitch, son.
Butterscotch MAGOO when two homosexuals rub their anuses together until it creates a milky substance.
Me and my boyfriend are gonna Butterscotch MAGOO each other, tonight.