Keyboard Plaque Share definition Flag 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. Keyboard Plaque by Liam.1 February 29, 2008 0 0 Get merch Get the Keyboard Plaque mug. Buy Now — $32.95 See more merch