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Niffie is an old Dutch street-slang word used to refer to a knife. It appeared mainly in older street culture and youth slang before modern slang terms became popular. The word is used in informal situations, often with a playful or slightly cautionary tone. Etymology: Derived from the English word knife. In street slang, knife shifted to nife → nif → niffie, with the “-ie” ending adding a typical Dutch informal sound.
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