A scallywag is a mischievous troublemaker, someone who causes minor chaos but in a way that's more playful than truly harmful. If your little brother hides your homework as a prank or a classmate keeps making jokes during a serious moment, you might call them a scallywag. The word suggests someone who breaks rules or stirs up trouble, but with a twinkle in their eye rather than real meanness.

The term often carries a hint of affection. When a grandfather calls his grandson a scallywag for sneaking cookies before dinner, he's not truly angry. He might even be remembering his own childhood mischief. A scallywag differs from a bully or a vandal: scallywags are rascals and pranksters, not people who hurt others or destroy things.

In American history, scallywag also had a specific political meaning during Reconstruction (the period after the Civil War), referring to white Southerners who supported Republican policies. But today, when someone uses the word, they almost always mean a lovable troublemaker, the kind of person who might rearrange all the books in the classroom by color instead of by title, just to see what happens.