A male suspicious person or crime suspect, especially a street person such as a drug dealer, pimp or panhandler. (Compare scumbag.) Popularized on the American TV police drama NYPD Blue
(US informal - in New York) A tramp or homeless person; perhaps a shortening of skeleton
() *From skeleton, describing the often skeletal appearance of drug users.
*Alternatively, from skellum or skelder ("to beg in the streets"). Used by Ben Johnson, 1599.