1.
Description of a sexual circumstance that involves jizz / cum / semen going every which way. Typically jizzasters would been seen when giving a facial, cumming on a girl's body or just spraying your surroundings with the stuff.
2.
Description of a pornographic video or photo in which jizz / cum / semen plays a prominent role
3.
Description of a situation that may include cum in the eye or other places it's not supposed to go, or is painful to experience / observe.
4. Synonymous with "Yard Sale" or "Train Wreck", but specifically as it relates to jizz / cum / semen getting all over everyone and everything.
"I finally met a gal on Tinder
that's cool with facials, so every time I see her it's a jizzaster!"
"I hadn't cum for a week and she gave me a handjob. Dude, next thing I knew her couch was a jizzaster"
"She wants me to pull out, but this time it blinded the poor gal. What a jizzaster."
"
Peter North is a god...every scene he's in is a fucking jizzaster!"
"Her mom's going to freak out when she sees what a jizzaster the back seat of the car is. We should've
cleaned up afterwards"