Niño rata is an insult used by
Spanish speakers. It can be translate as rat kid. The original meaning of niño rata was the spanish equivalent to
squeaker. However, in these days it is use to insult any young kid in general, regardless if (s)he is or not speaking via microphone, or even if (s)he is or not annoying. People that call kids by that way tend to relate them with games like
Minecraft,
Call of Duty or similars, or with famous Youtubers because it is believed that niños ratas love that. Regardless the
old that the word is, mexicans and argentians (specially the last ones) keep using the insult and tend to say it in English as rat kid, despite it is actually
squeaker.
Niño rata can be also shortened as rata. Though it can sounds ambiguous.