Dutch, short for: Je weet zelf(zelluf)
Common in the west of the Netherlands.

Meaning: You know. (lit: you know it yourself)

Mostly put at the end of a sentence.
Used to stress what has been said, or to put a sarcastic twist to it.
To stress:
my life is awesome, JWZ.

With sarcasm:
I'm doing -insert something really cool-, my life is really hard, JWZ
by grapjas January 13, 2012
Get the JWZ mug.
It means “je weet zelf” (Dutch) aka “you know it yourself”
Dutch: je weet zelf (JWZ) wat ik bedoel
English: you know it yourself (YKIY) what I mean
Get the Je weet zelf (jwz) mug.