imma get my brother on you

A term used in the hood when a weaker person, like a ghetto ass kid or a ghetto ass female is getting messed with or getting ready to fight with an older/stronger man and need to call their older brother to fight you. Other variations include “Just wait till I call my brother” or “I’ll get my insert older male relative on you”

Me - “Keisha you acting like a nigga, but if I treat you like one imma be in the wrong.”
Keisha - “If you touch me imma get my brother on you.”
Me - “I don’t give a fuck abt your pussy ass brother, I’d slap him too”