lolz0rs originates from the original phrase used by 9 year olds, lol, which means "Laugh out Loud" but this particular variant is used by geekdorks, startrek/scifi fans and the like..
Sarcastic; satirical way of taking the mick out of someone ((by adding it into your sentence)) who uses copious amounts of text talk and or who says frighteningly obvious things esp. on messageboards/chatrooms/msn. See ZOMG
gr8m872: OMFG!!!!! me n mi m8s wr at the cncrt lzt nite nd it ttlly r0cked. Wt a mint - brb!!! <3
Random person: ZOMFG!!!!!!1111oneoneoneeleven U went 2 c da show???? lolly lolzars BBQ!!
gr8m872: Stfu l0ser
Random person: O rly?
LAHLZUHERZ (lahl-zehr-z):
an exclamation used to express one's comic appreciation of something, generally a recent action or intangible idea.
Other acceptable spellings:
1. lahlzers
2. lolzerz(s)
3. LOLzerz(s)
Note
It is appropriate to occasionally drop the s or z at the end to lessen the intensity of the expression. The final degree of lessening the level of emotion (from "lolzer") is simply "lolz(s)." this is typically used to display almost a level of neutrality towards the previous comment, almost as if to simply acknowledge that it was said.
"By george Montgomery, I do find that racist joke you told me rather amusing"
"Quite Winston, quite"
"One might say, as I am currently rollerskating, that I have my lolzorskates on"