pee it off

Only guys will get this: you know when you use the bathroom at your house or someone else's house to take a piss and you notice a poop stain or two? And you felt like removing it without touching it? So you naturally aimed your stream at the stain to get rid of it. Yeah, that's called "peeing it off."

To tell someone to piss off without using the word itself.

Normally said by a nervous French teacher (who assumes everyone is his mate/if he is cornish, pronounced meat) to students on the back row having a laff-and-a-giggle meat.