Your mom has a bone to pick with me.
Bone to Pick
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This joke is playing on the phrase "bone to pick." Normally, it means someone is angry and wants to argue. But here, it's used as a "your mom" joke. The joke implies that the person's mom literally has a bone – like a skeleton bone – that she wants to "pick" or, ya know, 'do stuff' with.