Rat kid

(In South America)
A rat kid is a child between 8 and 14 years of age who play online games with an annoying attitude. Usually they scream in the mic with their high-pitched voices and are very obnoxious in general. They play games like League of Legends, Minecraft and watch all the trendy and hip Youtubers.

Guy 1: Hey Rat Kid, stop screaming and play quietly
Rat Kid: SHUT UP YOU FUCKING FAGGOT STOP KILLING ME!