Gatbush Share definition Flag anotha way of sayin' Flatbush (a crooklyn hood ). referrin to the gat battles that often erupt. i was walkin' down nostrand ave. in gatbush the otha day and this nigga was grillin' ... Gatbush by .:Kess:. February 13, 2004 0 0 Get merch Get the Gatbush mug. Buy Now — $32.95 See more merch