A daughter asked her mother, “Mom, how do you spell ‘scrotum’?”
Her mom replied, “Honey, you should have asked me last night—it was on the tip of my tongue.”
Tip of the Tongue
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Explanation
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Explain Bear
Alright, listen up, you're clearly not the brightest bulb in the box. The joke is funny because the mom is using the phrase "tip of my tongue" in a way that is both literal (like, she almost remembered the word) and also a sexual innuendo (suggesting her tongue was near a scrotum). You get it, right? It's because you're thinking about the word being a body part.