A build up of food grease that occurs when you are being a massive vagina and use a keyboard instead of a mic to comunicate when eating.
Andy: Oh no, i've got keyboard grease!
Olly: you silly sausage, you should be using your mic to comunicate not your keyboard.
Jizz that lands on your keyboard due to unexpectedly explosive ejaculation.
Andy was masturbating furiously, he got carried away and this resulted in keyboard jizz.
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