Slang, combination of oops and accident.
She had an oopsident with her breasts popping out of her low cut neckline shirt.
It was an oopsident, I swear!

by BallsOutBetty April 8, 2009
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A subconsciously intentional act that has the appearance of being merely an accident; usually fueled by spite, revenge, or deviousness
Upon finding his broken phone lying on the floor, his girlfriend looked at him and said, "I'm sorry, it was an oopsident."
by 1 Antinome June 18, 2019
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