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1.
Dancing when one should generally not be dancing. Usually followed by regret, embarrassment, hangover.
"How was the wedding last night? Any accidance?"

"Aunt Lori was grinding on the best man...Lil Wayne came on. Accidance happen, I guess."

"Ya can't take her anywhere...she is an accidance liability."
by Dooodshhhh November 10, 2011