Top Definition
When suddenly everybody wants to play with a toy or item (like a keyboard) that has been buried under the bed or tucked away in a closet for years.
Raul: I found this keyboard under the bed. I'm gonna learn how to play the Star Wars theme on it.
Brock: Hey! Gimme that! It's mine!!!
Raul: It's been collecting dust under the bed for 5 years and now suddenly you want to play it? That's Keyboard Theory.
by phalagen June 18, 2013

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