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A person who’s one biscuit away from being a full-blown fatty. They’re like a sausage link about to burst, and that biscuit is the last link in the chain.
My cousin is a biscuit away. He’s already got a belly like a deflated balloon.
She’s a biscuit away from needing a wheelchair.
That guy at the buffet is a biscuit away from being a human meatball.