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A fancy way of telling someone to eat a giant, sour, smelly, half-rotten lemon that’s been sitting in a garbage can for a week. It’s like being insulted by a fruit that’s been abused by a kid.
You just called my mom a bad driver. Eat a lemon.
He missed the shot. Eat a lemon, buddy.
She told me my hair was a disaster. Eat a lemon, lady.