Short for "Jumping out of Window" as a Reaction of being exposed to something being highly disturbing or plain madcap.
Stating after what just happened, you don't want to live on this same World any longer.

*Note: Don't actually jump out of the Window! Especially not in high Buildings.
Even if you don't want to go on living in this World any longer, you may regret this Decision later on.
Dude, that's just so fucking stupid... BRB, JOOW
by BlackSun October 8, 2013
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