Burnt Sock 

Burnt sock is the result of copious amount of anal sex, causing high levels of friction within the anus. After the inevitable combusion, the interior rapidly prolapses. The result is a burnt sock (similar to pink sock).

Man, I fucked Carey in the ass for over 40 minutes! She fucking burnt socked on me!

Burnt Sock by Alvin the fudge packer October 9, 2010

Sock Burn 

A condition that occurs only in men, after aggressively masturbating with a sock for extended periods of time.

I had to masturbate with a sock last night and got sock burn

Sock Burn by Sephi1n6 December 20, 2009