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.
Who said that? WHO THE FUCK SAID THAT? Who's the slimy little communist shit, twinkle-toed cocksucker down here who just signed his own death warrant? SIR I SAID IT SIR! Well ... no shit. What have we got here, a fucking comedian? Private Joker? I admire your honesty. Hell, I like you. You can come over to my house and fuck my sister. You little scumbag! I've got your name! I've got your ass! You will not laugh! You will not cry! You will learn by the numbers. I will teach you. Now get up! Get on your feet! You had best unfuck yourself or I will unscrew your head and shit down your neck!
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!