You little rascal, you've messed up the room again!
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Affectionate, not really scolding - 包 (literally 'bundle') here works like English '-bag' or '-pot' to make a personal nickname (cf. 调皮包, 跟屁虫). Mostly used by adults toward kids they like.
culture
《淘气包马小跳》 'Mo Xiaotiao the Mischief Maker' is one of the bestselling Chinese children's book series of the 2000s, by Yang Hongying.
