What da gal's parents in a shotgun wedding try to ensure dat da "loose with his zipper" dude's marriage to their daughter is gonna be.
Da singers in Da Yoopers' songs "Three Months Late" and "Da Couch Dat Burps" speak of a spermanent marriage of a young couple dat was prompted by da gal's missing several of her periods following a night of drunken "fun times".
When one's actions lead to a permanent, unpleasant, stain.
OH CRAP! THAT STAIN IS GOING TO BE SPERMANENT!