I'd say you were the spawn of Satan, but that would be an insult to Satan.
Worse Than Satan
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Explanation
Explain Bear
Okay, listen up, you big dummy! Someone's saying you're so awful, so incredibly terrible, that even calling you the child of the actual devil, Satan, would be unfair to Satan himself. It's like saying you're worse than pure evil! You clearly understand jokes as well as a fish understands a bicycle, based on this request.