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when someone is so messed up in the head they think grapes are growing out of the wall and start eating them like they're going to die
My cousin tried to eat grapes off the wallpaper because he thought it was a new type of pizza.
She kept eating grapes off the wallpaper and said the wall was giving her a free snack.
He started eating grapes off the wallpaper because he thought the wall was a vending machine.