While at the movies, you take a tub of popcorn and make a hole at the bottom. Then you stick your dick through it and while watching the movie, your date sticks her hand in it as if to grab popcorn. This will look that way to the movie-goers around you. In reality, she jerks you off inside the tub until you cum all over the popcorn and then she eats it. Hence: butter the popcorn.

Sean: "I'm taking Melissa to the movies tonight. You know how easy she is, so I know we are going to butter the popcorn. I'll text you tomorrow and tell you all about it in complete detail. I'll even save you some of the popcorn."

Matt: "Dude, isn't that kind of gay?"

Sean: "Hey, I won't tell if you don't."

by R.U. Sirius August 1, 2008
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The cum covered body of the person in the center of an orgy.
Friend: Dude, where were you last Friday?

You: We were buttering the popcorn in the locker room.
by Themadpotato55 May 24, 2017
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The act of fucking someone in the ass who has eaten corn for a week straight, while using buttered flavored crisco as lube. When the heat from the friction of sex starts to build you can smell buttered popcorn. Carefull not to do it too fast or the pocorn will burn.
Last night Betsy and i made buttered popcorn.
by glassballs4u October 30, 2016
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When you fill your hand with squeezable butter then add popcorn kernels, then beat off creating friction till the popcorn pops.
by Big juicy jay July 29, 2020
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