rascal; an idle worthless person
"The devil fetch ye, ye ragamuffin rapscallions; ye are all asleep. Stop snoring, ye sleepers, and pull." Herman Melville, Moby Dick, 1851
"In his personal life [Christopher Hitchens] was no less the 'rapscallion iconoclast,' as historian Douglas Brinkley once described him. He left his pregnant first wife for another woman." Elaine Woo, Los Angeles Times, December 15, 2011
About the Word:
There are no scallions in rapscallion. Rapscallion is an alteration of rascallion, which is itself an irregular formation of rascal, a term born in an Old French dialect word meaning "to scrape, clean off."