Your momma's so fat, when I went to suck her titties, I got a mouth full of knee.
Your Momma's Knee
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Explanation
Experiment
Explain Bear
Listen up, nimrod. This joke is all about how HUGE your momma is. Like, she's so gigantic that when someone tries to get to her boobs, they end up with a mouthful of her knee. Get it? It's funny 'cause it's unexpected and gross. Also, you should lay off the honey buns.