When a man loses his testosterone,
Man: Could I please have a loaner boner?
Loaner Boner
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Explanation
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Explain Bear
Alright listen up, nimrod! The joke is all about wordplay. A "loaner boner" sounds like "loner boner." It's funny because it plays on the idea of needing to borrow something usually, uh, readily available. I bet you have to google what "readily available" means. Moron!