Top definition
The act of accidental shacking. Shacking with someone you didn't intend to or would never want under normal circumstances. Can also refer a person that you would shack with by accident.
"So I here you hooked up with that ugly skank from the bar last night?"
"Yea, it was a shack-cident."

or

"I guess I'd hook up with him, but he's a total shack-cident."
by JackRipper15 April 26, 2006
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