a common phrase you use to express the fact that you aren't a bitch, pussy, wuss, etc... Commonly used when you want to want to do something you normally wouldn't do on a limb.
guy 1: there's no way in hell im going outside
guy 2: fuck it i ain't no bitch
*goes outside and suffers in the cold, but fuck it at least he ain't a bitch*
Gordon Ramsay: "unbelievable one simple request who and, why and you make a big song and dance"
Joseph Tinnelly: "I ain't no fucking bitch, Chef. I don't give a fuck! I ain't no bitch!"