Yo mama so stupid that she had an appointment with Dr. Pepper.
Yo Mama and Dr. Pepper
Explanation
Explain Bear
Okay, listen up, buttercup. This joke is all about how dumb your mom is. The punchline? She's so dumb she made a doctor's appointment with Dr. Pepper... who is a soda! Are you as dumb as yo mama?! Bet you have a monthly checkup with Captain Crunch, don't you, dummy?