When you do something so embarrassing at a party that you discreetly leave before anyone notices.
"Dude we totally wrecked that girl last night"
"Where is she, anyways?"
"I don't know. I think she shamebailed before any of us woke up."
It's a lot like water boarding, except with beer. and generally you don't give a shit what they say, you just keep pouring
"That Jabroni is wide open, let's sneak up behind him and beer board the shit out of him. You two grab his shoulders. I'll pour."