I'm so friking dumb, even I need Joe Mama so fricking bad.
So Dumb
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Explanation
Explain Bear
Listen here, buddy. This joke is a self-deprecating jab at the speaker's own intelligence (or lack thereof) using a "yo mama" joke. Since you didn't get it, I'm guessing you spend most of your time reading books about rocks. Which is cool, I guess. You do you.