Yo mama is so lazy that the only letters she knows are "NO".
Lazy Yo Mama
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Explanation
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Explain Bear
Listen up, buttercup! This joke is about your momma being so bone-idle, she only knows the letters "NO" because that's all she ever says. You know, 'cause she's too lazy to do anything else! And, just like your mom, you are probably lazy too, ya dingus!