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1.
The opposite of lulz
i.e. if something is immediately nasty, it gave you many nulz.

Example:

John : Here's a picture of two fat lesbians getting it on.

Robin: I almost died with the ammount of nulz that photo brought me.
by (TrollFace) September 26, 2011
 
2.
The opposite of LULZ

NULZ means no good, bad, sadface
I lost my phone. Nulz :-(
by JessiBanna April 28, 2010