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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"
by toofastcharlie January 11, 2009
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