At the Movie theater, Your girlfriend cuts a hole in the bottom off the bucket of popcorn and places his penis threw the hole. She then sticks her hand in the popcorn and gives him a handjob...
the process of cutting a hole in the bottom of a LARGE bucket of popcorn sticking your dick through it and letting the other person give you a hand job
made famous by Kevin Hart in his comedy special: Zero Fucks Given
butter beatoff:
Ha-ha! Ah. A butter beat-off. I know that's right. a butter beat-off