My mom showed me that she could deep throat a banana. I asked my mom how you know how to do that. My mom said, "I practice on your new stepfather."
Banana Practice
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Explanation
Explain Bear
Alright listen up, buttercup. The joke is that the mom is implying she gives head to the new stepfather. And she's using a banana as a practice prop. You probably still don't get it because you're too busy eating glue.