LOLZ
Etymology
Interjection
LOLZ
(Internet slang, leet) Alternative form of LOL
Usage notes
The final Z serves only to make the acronym look like a plural noun, or, more commonly, as a mockery of those who use z to pluralize other nouns, as opposed to s. The mockery of such people is often not done in any kind of specific context, but usually as a way to lighten up a conversation.
Etymology
A corruption of lol, probably a leet variation, treated as if it were a noun rather than an interjection and pluralized in a deliberately unconventional manner.
Interjection
lolz
(Internet slang, leet) Used to express laughter, often in a sarcastic fashion.
Source: Wiktionary