[last night i hooked up with a chick and, when she was sucking my dick, i  was the victim of some unfortunate back scrape
the unfortunate circumstance that occurs when a male is receiving oral sex and the person giving the oral sex accidentally applies teeth to the man's penis
"[last night i hooked up with a chick and, when she was sucking my dick, i  was the victim of some unfortunate back scrape" What is the definition of "back scrape"?