cut the brownies
A sexual act of deficating into a small ziplock bag, then placing the warm lump on your significant other's face as they sleep, then, when they away, yell "Cut the brownies!" And pop the bag with a pin, causing it to splatter all over his/her face.
"How did the night with Jessica go?"
"Aweful, she didn't put out so I cut the brownies that morning."
"Aweful, she didn't put out so I cut the brownies that morning."
cut some brownies
Poop.
Grandma: I need to go to the powder room to cut some brownies.
Grandson: Huh?
Grandson: Huh?