Literally translated into “ratboy”, this is the name people in Mexico and latin American gave to pre-adolescents with a squeaky voice, that are playing games online (most of them not intended for their age), and screaming, yelling and insulting other players.
They tend to be very young, from 10-15 years old, and their biggest stars are youtube and twitch videogame streamers, who they love almost religiously.
It became a very popular trend/internet meme, and if you do something someone else don’t like in a game, when you are online, they call you “niño rata” in a teasing manner.
The real inspiration for this word it’s an early simpsons episode, in wich Homer calls Bart Ratboy.
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I hope you have learned something new, about the spanish that real Mexicans talk on their everyday life.
If you want to improve your Spanish, I also give tutoring lessons on skype using this page that host many teachers from all over the world, and while I don’t really do grammar, I can help with conversation and doubts about the language. Also, if you are interested in any language besides spanish, there are teachers and tutors for any language there.