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.
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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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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