A Luke joke is a joke that's so bad nobody but the person telling the joke laughs. A Luke joke is also usually followed by stares of disbelief at the joke-teller's complete lack of humor.
Person 1: "So you know what killed the dinosaurs?"
Person 2: "A Meteor?"
Person 1: "No. DinoSARS! (laughing uncontrollably)"
Person 2: "You're a retard. Stop telling Luke jokes."
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the worst your mum jokes out there... with no one laughing but himself
guy 1: your chicken looks dry as hell
luke: your mum is dry as hell
lukes your mum jokes
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