Your momma is so hairy that when you were born, you got rug burn.
So Hairy Momma
Explanation
Explain Bear
Listen up, buttercup. This joke is all about how hairy your mom is. Like, so hairy that when you, the genius child, popped out, you got a rug burn. Get it? It's 'cause she's so furry, she's basically a rug. And based on you laughing at this, it must have happened to you.