Your mom is so fat that when God said, "Let there be light," he asked your mom to move out of the way.
Your mom is so fat
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Explain Bear
Okay, so basically, this joke is saying your mom is super overweight. Like, so big that even God needs her to move so He can create light. It's a fat joke, and you, clearly, are the butt of it because you're too dumb to understand it yourself.