A mischievous person, especially a playful, impish youngster.
My nephew is a little scamp who likes to leave lighted firecrackers under the lawnchairs of his dozing elders.
While walking home from the bar, he was set upon by a bunch of scamps who stole his hat.
verb
(dated) To skimp; to do something in a skimpy or slipshod fashion.
1884, Samuel Smiles, Men of Invention and Industry
His work was always first-rate. There was no scamping about it. Everything that he did was thoroughly good and honest.