Very similar to the
donkey punch in which while having anal sex you punch the
unlucky lady in the back of the head causing her asshole to contract. Only in this instance, you immediately pull out as her asshole
contracts forcing her bloody rectum to be pulled out with your dick.
"Dude, I gave that bitch the Bloody
Red Sock last night that's why she's
walking funny"
"
My asshole is killing me, that prick Kevin gave me a bloody
red sock last night"