A snatch back is defined as a GF or wife who is bitching out their boyfriend or husband so intensely, that the man ends up having a sore back....., or otherwise referred to as a snatch back.
My GF was rippin my ass out harshly over the fact that I spent the night before out wit da boyz at the 02 watching the fights and after a while, she was being such a snatch, ridin my ass so bad that my back started achin brutally. The chick actually gave me snatch back. S'up????