An argument on an internet mesageboard that soon spirals out of control with everyone getting involved, and in the end no-one really knows what the argument was about !!!
Bin is short for BINNER which describes somebody who is a complete MOWTCHOPS. Ergo, a binfest is a festival of binners normally arguing the toss over something that matters not in the real world.
A single night to week long festival of alcohol consumption marked by a series of regretful decisions and shameful behaviors including, but not limited to slut spirals, memory loss and various embarrassing public displays of said drunken state.
After Dan blacked out and was arrested for dancing on top of a car naked it was concluded he was on a bingefest.