After waking up from a night out, you find yourself in a stranger's house completely naked, apart from one sock. This sock can be used to save any embarrassment, e.g. small cock, pierced balls you don't want her Mother to see, while acting like a coverall to help you on your search for your clothes.
NOTE: Depending on 'morning wood' status, balls can also be cupped in the cock sock.
Kyle: "Hey man, where did you go after cav?"
Dennis: "Back to some bints flat, woke up in the morning starking and all I could see was a nappy or my sock, so I did the old 'cock sock', found my shit then climbed out the window,"