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A pile or puddle of nondescript goop left by an unidentified family member, usually a dog or a cat or another non-human, ambulatory creature.
Careful where you walk; one of the cats had a yakcident in the living room this morning and there might be more that I haven't discovered yet.
by bellbottoms August 12, 2011
accidentally upvoting a post on yik yak that you meant to downvote (and vice versa). Yakcidents suck because you can't undo a yakcident. Also used as yakcidental and yakcidentally.
Ahhh shit man, I yakcidentally downvoted my own yak!
by whodawhat October 24, 2014