look up any word, like dirty sanchez:
 
1.
Comes from the word "lulz"
Which comes from "lol"
which means

Laugh out loud.
Lulz0rz is just 1337 speaking taken to an extreme.
Blah1: omfg i r winrar
blah2: lulz0rz u r teh lose
by Thy paperclip October 01, 2007