Shiz

Shiz is the word used instead of shit when someone doesn't wanna swear.

But there's another definition which makes way more sense.

So shiz is when you shit and jizz at the same time.

So you're on the toilet jacking off, and u feel the need to shit, so you're shitting and at the same time while you're shitting u get an orgasm and jizz. so that's what's called shizzing.

Guy 1: Bro omg yesterday I was shizzing for the first time, It felt so fucking damn good
Guy 2: wtf is shizzing?
Guy 1: What you seriously don't know? It's when you shit and jizz at the same time.
Guy 2: Is that even possible wtf?
Guy 1: yeah duhhh it feels sooo good