You are fucking doggie style. You pull out,
jizz on the
asshole, pee on top of the
jizz, then you let him/her fart and spray it all over you.
You- "Dude, I was fucking this
chic last night and I jizzed on her
asshole and covered it in
piss!".
friend- "What'd she do bro?"
You- "She farted on me man!?!?!?"
friend- "Bro, you got skunked!!"