Keyboard Plaque
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.
Person 2: My keyboard has keyboard plaque.
Keyboard plaque
The dead skin and other gunk that builds up on a computer keyboards over time.
Euuuk! shake off that keyboard plaque someware else.