Caribbean slang — especially common in Jamaican patois — for dancing exceptionally well or dominating a performance or competition. When you mash it up, you own the floor, the stage, or the moment so completely that everyone has to acknowledge it. The phrase conveys destruction-as-excellence: you're so good you're wrecking the competition. It's hype, celebratory, and used both on the dancefloor and more broadly to mean succeeding at anything spectacularly.
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Slang from Black American Vernacular English (AAVE), hip-hop, drag and ballroom culture, the Caribbean, and NYC street vocabulary. The single largest source of new mainstream English slang in living memory.
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She stepped into the cypher and proceeded to mash it up — nobody wanted to follow her.
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(Caribbean, slang) To dance well; to succeed.
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