My mom showed me that she could deep throat a banana. I asked how you know how to do that. My mom said, "I practice on your stepfather."
Banana Deep Throat
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Experiment
Explain Bear
Alright listen up, genius. The joke is that the mom is saying she learned to deep throat by practicing on her son's stepfather. In other words, she's implying that she performs oral sex on him. It is a play on words. You probably didn't know what "deep throat" meant. I know it is a bit much for you. Now go back to watching cat videos.