brat convention Share definition Flag Chuck E Cheese,Wal Mart ie. Squall Mart,public library, or anywhere small screaming children congragate. Let's go to the library early,so we can avoid the Brat Convention, of screaming kids. brat convention by RTBSTRD November 4, 2013 0 0 Get merch Get the brat convention mug. Buy Now — $32.95 See more merch