A fart which happens to leak out by complete accident. Like while walking, laughing, or giving a major power-point presentation.
Stephen: "God, this date has been wonderful but I'm afraid it's time to leave."

Blair: Get's up from her chair to walk away from the dinner table and says "Ooops! That's was a faccident"
by thesearefusesnoriver February 9, 2011
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an injury sustained during a period of fucking
Adam and I fucked so hard last night, he had a faccident.
by Big McLargehug May 5, 2016
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