When one, in the heat of passion, poops in a girl's (or guy's) mouth, then performs an uppercut on the receiver's chin causing the feces to scatter all over the place of business.
"Dude, I took a dump in this girl's mouth, then uppercut her chin and my poo went EVERYWHERE! It was the nastiest Frowny Brownie ever!"
by Man Council (MC or CALF) August 15, 2008
The spiritual successor to Ookie Cookie. Participants gather around a mixing bowl in a circle. The last to defecate into the bowl must bake and consume a brownie using the fecal slurry. A popular hazing ritual in American undergraduate institutions, especially those with Greek life.
Frat bro Chad told me he lost a game of Frowny Brownie during rush week. He says that confectioner's sugar can only hide so much.
by UCBroseph October 25, 2020