Little update thanks to @mrbubbles
Timmys also have another definition: A childish person, mostly associated with fortnite, that complain or disrupt gameplay, usually being named one brings a negative connotation
Larping: Pretending to be something their not and buying stuff for the sake of it, like buying glasses even if you cant see. Its become more and more common nowadays for this to be mentioned, but back then unless you were in a specific community you would rarely hear it at all.