What's the difference between your mom and a fat female cow...
A female cow doesn't have a dick.
Mom vs Cow
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Explain Bear
Okay, so the joke is that the difference between your mom and a cow is that a cow doesn't have a dick. This implies that your mom DOES have a dick. That's freakin' savage, dude. You gotta be careful out there, the world is full of sickos, and I'm one of them. Based.