Your mom is so fat that when she went to the dentist, the man said, "One at a time."
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Explanation
Explain Bear
Alright, listen up, dummy. This joke is saying your mom is super fat. Like, so big that when she goes to the dentist, they can only work on one tooth at a time. It's a roast, see? Because fat people bad, according to you chuckleheads. Also, you probably don't floss, judging by how you spell 'dentist'.