It took me some time playing gta to
understand this meaning as many people on
urban dictionary just say this translates to “I’m a dick.”
This term is
associated by tryhards in gta and sometimes other games, and is an expression used when a successful kill takes place. The term “Lzz” (amount of Zs can vary) is a combination of the word Ez — as in slang for easy — and L, as in a loss, meaning that the person the term is directed towards was both easy to defeat, and also just took an L as a result. The term is used as a taunt and/or insult.
It is also typically fair to assume that the person saying Lzz is not in fact very skillful, or smart, and will get easily butthurt if you successfully counter attack them.