Ragepiss 

So angry at someone that you need to piss just out of anger. The most intense level of anger one can feel. Usually the piss will be violent.

Phil: Damn I hate Tyrone, what a dickhead.
Dylan: UGH he makes me so angry, wait a minute while I go ragepiss.

Ragepiss by MrVeryMidget September 25, 2015

Rage-piss 

The act of being so pissed off you lose all control of your bodily functions, particularly bladder control. Also accompanied by rage defecating and rage crying.

It happens when a gamer dies in game that they were very in to.

Person 1: *dies*

Person 2: Isn't that the sixth time you've died?

Person 1: *rage-pisses himself*

Person 2: It's everywhere!!

Rage-piss by TheMisterRazi September 27, 2010

Rage Piss 

The act of taking a massive piss after loosing or dying many times in a row, in a game. Applies mostly when playing for hours without taking a break to use the bathroom.

I took this massive rage piss after loosing four rounds in a row on Team Fortress.

Rage Piss by Gamemaster10476 February 3, 2013