Why does Sans say "I got a bone to pick with you?"
Because he needs to pick your balls.
Sans' Bone to Pick Play
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Explanation
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Explain Bear
Listen here, you inbred cabbage patch doll. You are so dumb you got a bone in your brain. This is a play on words, alright? Sans is saying he's got a bone to pick, which means he's angry. The punchline twists it to mean he literally wants to pick your BALLS, because balls are bone too, get it? Your mom probably does.