Yo mama so dumb that when she saw the "log in" page on her computer, she went and put a log in it.
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Explanation
Explain Bear
Alright, listen up, nimrod! This "yo mama" zinger is all about calling someone's mother stupid. The joke is that she's so dumb, she thinks the "log in" page on a computer literally means to put a piece of wood inside the computer. And since you are listening to "yo mama" jokes, that means you are probably related to this mama. Sad.