ain't my bitch 

The same as saying "that's not my problem". Coined from the classic Metallica song off of Load.

Draggin' me down, why you around?
So useless
It ain't my fall, it ain't my call
It ain't my bitch

ain't my bitch by the bg September 5, 2004

Ain't no bitch in my blood

A statement declared to affirm one is not afraid of anyone or anything; to be used in the midst of a situation or function (drinking game, dare, fight, etc.)

Bruh, if we swingin' we swingin. Ain't no bitch in my blood!

Man, pass me the bottle. I'll kill this whole thing, shit. Ain't no bitch in my blood.

Ain't no bitch in my blood by stoicaldefinitions January 22, 2017