Hi @Forum_Folks
I feel like I'm missing out on something here.
What is "Brat" a noun? a verb?
Is it youthful jargon, like the ole "Keen" or "Hip" or "kewl" were
I've searched Google, incl Slang, & nothing seems to fit. Is it a dance? a Song? Jargon for something? or a Brand name? 
Your kiddos would probably know, if you're comfortable asking them, since they seem to know Cell Phone stuff too.
Due to recent move, I dont have access to those former Grades 1-7 neighborhood kiddos to ask.
(BTW, apparently, kids are referred to a "kiddos" now too, Im told).
TIA
"Don’t forget to be kind to strangers, for some who have done this have entertained angels without realizing it!" (TLB)