What is Keyboard Plaque?
1.
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.
See 
2.
The dead skin and other gunk that builds up on a computer keyboards over time.
Euuuk! shake off that keyboard plaque someware else.
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  How your face looks after you puke.
So ugly ones face looks like puke.
Your so full of crap it starts to come out your mouth.
Your ..