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1.
A human sock is a person (usually female) who's only redeeming quality is being proficient at sexual intercourse, or is very willing to participate. Can also be used for a Nymphomaniac. Refers to the act of masturbating into a sock to avoid stains on upholstery/textiles.
"What about Sarah, is she DTF?"

"Well yes, but don't ask anything else of her. She's a human sock.
by Bruce Springsteen McCambell August 15, 2011