scallywag
/ˈskælɪwæg/( <美> 亦作scalawag)
noun
1- informal a person, typically a child, who behaves badly but in an amusingly mischievous rather than harmful way; a rascal〈非正式〉淘气鬼（尤指儿童）; 无赖, 流氓。
1.1
- US a white Southerner who collaborated with northern Republicans during the post-Civil War reconstruction period〈美〉内战后重建时期与北方共和党人合作的南方白人。
词源
mid 19th cent.: of unknown origin.