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Food particles and other small unknown particals which are between keys on the keyboard.
Person 1: OMG, is that a cornflake in your keyboard?
Person 2: My keyboard has keyboard plaque.
by Liam.1 February 20, 2008
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The dead skin and other gunk that builds up on a computer keyboards over time.
Euuuk! shake off that keyboard plaque someware else.
by Blue Cawdrey November 18, 2004
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