An epic failure spelling of lulz, used with an 'r' rolling sound to try to be cool. Coined by wannabe high schoolers who then use extremely consistently to piss you off. Mostly spoken orally, if used in messaging, an abysmal dickfail.
Danny Jr: Did you see that insane cat video?
Martin: Yeah, it was lulz.
Random ****: Rulz!
Martin and Danny: DUMBFUCK
An incorrect way to spell rules. Most commonly written by the lazy, dyslexic, and just plain old Down Syndrome victims.
Rulz is not a word. Unless it happens to be your last name, then I feel sorry for your 1337 wannabe parents.