Jarateed or "Jarate" is a synonym for "Pissed off" or "Piss".
It was derived from Valve's game "Team Fortress 2" in which the character, Sniper, uses a mason jar full of urine. The in-game name for it is "Jarate" and upon throwing said jar the character will yell "Jaaarate!"
Jarateed is also a word replacement for "pissed" on the Steam User Forums. The word filter will replace "Pissed" with "Jarateed". Clever reference on Valve's part.
Jarate is the last Sniper unlockable from the popular online videogame "Team Fortress 2". Described as "Karate in a jar", it is literally a glass jar of human urine, ready to be chucked at an unsuspecting enemy.
Jarate, or the art of flinging jars of urine at your enemies, is guaranteed to result in “psychological damage, blindness, embarrassment, nightmares (with you as the star!), self-loathing, difficult stains and intense body odor."
This is an unlockable move/weapon for Sniper in the game Team Fortress 2.