1, 2, 3, A, B, C, D, and there's a D in it and there's also a 3. That's how long your D is!
Length Insult
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Explanation
Experiment
Explain Bear
Alright, listen up, nimrod. The joke is using numbers and letters to make a point. The person says "there's a D in it and there's also a 3" which is supposed to mean that the other dude's "D" (ya know, his uh... ding dong) is only 3 inches long. It's a dumb insult, but hey, you wouldn't get it otherwise, would you?