I'd tell you a joke about my boyfriend's dick, but it's a private joke.
Private Dick
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Explanation
Experiment
Explain Bear
Listen up, nimrod. The joke is funny because it uses the double meaning of the word "private." On one hand, it means that only she and her boyfriend know the joke, but on the other hand, it's also a euphemism for the boyfriend's private parts. Get it? No? Figures.