Pee on you or piss on you was made highly popularized by the song "Pee on You" by Dave Chappelle, in an attempt to characterized R. Kelly's peeing on some young bitches.
"I want to pee on you, piss on you...drip drip drip...pee on you..."
When a guy is acting girly or kinda limp-wristed, tell him "You sit down when you pee" as in he's acting like a girl, so why not use the pisser like them
Paul:That cd was like, so totally SUPER!!!
Jonh:Dude, You sit down when you pee!!