Birth defect in women where the Fallopian tube is not developed properly and during the teenage years, this causes it to rupture. This causes the blood to spray, alongside chunks of feces, out of your anus leaving a warm and moist sensation. Very uncommon during the practice of sexual intercourse, however witnesses leave the bedroom with every desire to commit suicide.
Charlie: Dude, Don't go out with Candy, shes like one of them sexually challenged bitches, we did anal once and she totally did a 'Happy Spray' all over me.
Brent: Sick bruv, I hope you washed yourself off after that.
"I'd rather get Happy Sprayed twice, than have to go out with Heather Mills"