When the man on top during double vaginal sex pulls out and cums on the other man's scrotum. After using his dick to rub the cum all over the scrotum, he then re-enters the girl's pussy to cum again on the other guy's shaft. Due to the homoerotic nature of the act, it is mostly performed by bisexual men. However, straight men can perform it on occasion.
My bi friend and I once did double vaginal with a girl we picked up from the club. I was on top, so I decided to give him a slimy joystick since it was his birthday. I don't like guys, so I told him that's as far as he would get with me.
While your buddy is sleeping you spread your asshole over his/her mouth and take a wicked shit in it. You then duct tape there mouth closed. Its a real nasty surpise!
The act of taking a shit, and ejaculating on top of it, causing a slimy brown mixture. Once the mixture has been well kneaded, yell "Wouf" and smash it in your partners face. Hilarious, but not recommended for first dates if you like the person. Best used during revenge sex.