The meaning derives from the movie "Zombieland"
but it usually means a waste of sperm or just another way of telling someone they are accidents of birth.
Dude 1: Hey when were you born?
Dude 2: idk my parents never told me...
Dude 1: Dammm You must have been an accident....what a spitfuck
Dude 2: Fuck you ass hole
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