A house party where the host is constanly asking for money because he or she thinks the host should not have to throw down any money for the keg or liquor.
Example (break-even party):
Partygoer 1: "Hey man, where are the cups?"
Host: "The cups are in my room. Give me a few bucks and I'll get you one."
Partygoer 2: "You are charging for cups?"
Host: "We are using my house, I should not have to pay anything for the keg."
Partygoer 1: "Damnit I hate break-even parties."