scalawag

noun

1. (derogatory)A disreputable fellow, a good-for-nothing, a scapegrace, a blackguard.

   “Calvin: "I'm very very sorry that I took your precious flaaggg!" Hobbes: "Just don't do it any more, you scurvy scalawaaggg!"”

2. (informal)A badly behaved person, especially a child; a mischief-maker; a rascal.

   ““This ruckus never seems to end.” (Colin laughing) “He's very loud, and unlike us, he does not sleep during the day.” “Nor does he sleep during the night.” “When does he sleep?” “I don't think he does.” (glass breaks) “Never a dull moment with that scalawag.” “I'm pretty sure he must be part demon.” “Nonsense. He's all boy.””

3. (archaic, derogatory)A scrawny cow.
4. (US, archaic, derogatory, historical)Any white Southerner who supported the federal plan of Reconstruction after the American Civil War or who joined with the black freedmen and the carpetbaggers in support of Republican Party policies.

   ““And you, Hugh Elsing, I’m ashamed of you! What will your poor mother say? Drunk and out with a—a Yankee-loving Scallawag like Captain Butler![…]””

5. (Philippines)rogue police; rogue military personnel