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!
said person isn't a "wuss" or is badass in some way. This can refer particularly to an instance in which someone is drinking, smoking, or doing something extreme.
Tom: "I bet you cant drink another shot" -offering another shot of vodka
Jim: "Daddy aint no bitch" -takes shot without puking
Similar to "calling shotgun" in vehicle seating preference. "I call no bitch" means that you do not want to "sit bitch" in a vehicle. To "sit bitch" means to sit crammed between two people on a bench seat in a car/truck/van.
In the almighty internet code book Letrolacus 6:9 it states that "In thou mighty world of the internet, no bitch is a 10." This means that no matter how pretty a bitch is, she will NEVER be a 10, since the almighty bitch calculator (personality*body*face/3=scale P*B*F/3=scale) dictates that if her face is the consistency of butter, she shall not be a 10.
Jake : Yo Timmy, look atdat bitch dawg, 10/10
Timmy : Naw man, no bitch is a 10, she's prob a hoe