A congregation or social gathering of bros where sexual interaction is commonplace and practiced through broshakes, asspats, and chestbumps among other bromosexual exchanges of bromanticintercourse.
David: Hey, I think I'm going to go to that party on Snelling.
Jack: Don't! I heard it's an all out brorgy.
David: Fuck. Thanks for telling me.
An event at which high concentrations of bros are present. Although sexual activity between aforesaid bros is typically absent, it is understood to be liable to erupt at any given time. A portmanteau of the the words "bro" and "orgy."
"Wow, that Jack Johnsonshow was a brorgy if I've ever seen one."