to bring left over, warm or incredibly inexpensive beer to a party with no intention of drinking them, then leaving those beers in the host's cooler/fridge and drinking from the keg, or pulling other people expensive beers from the cooler/fridge all night.
shit-beer(ed) past tense
Ted: Had a good time at the party on Saturday. How was the clean-up on Sunday?
Fred: Not too bad, no one puked. But, Dom shit-beered me again. I found four warm Southpaw Lights in my cooler this morning.