noun
a derogatory slang term used in British English to describe a young person, typically male, who engages in anti-social behavior
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The young man was known in the community as a scally due to his frequent run-ins with the law.
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I saw a group of scallies hanging out at the park yesterday.
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Those scallies are always causing trouble in the neighborhood.
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His messy hair and torn clothes gave him the appearance of a scally.