scallywag; scallawag; skallywag noun a disreputable fellow US,1849
You are the father of triplets, sir, you lucky skallywag! — Barry Humphries, BazzaPullsItOff!, 1971
[H]e’s a rascal, no question about it. He’s a scallywag–but, I can’t buy Arthur, I mean, Daley, as a drug dealer. — Anthony Masters, Minder, p. 156, 1984