two-bagger

(slang) A double (a two-base hit).
(slang) A two-miler when running miles for conditioning.
(derogatory, slang) An extremely unattractive person (usually female), the insinuation being that one bag covering her face would not be adequate, but that a second one is needed, usually on the observer's head, sometimes specifically during sex. This meaning is often associated with a joke by comedian Rodney Dangerfield.