bro-by girl Share definition Flag When you wanna call someone bby girl but they're a guy and you guys are no-homo so you call eachother bro-by girl Person1: you're my bby girl, no homo tho Person 2: so I'm your bro-by girl? Person 1: yeah bro bro-by girl by handmethenoose April 1, 2017 0 0 Get merch Get the bro-by girl mug. Buy Now — $32.95 See more merch