What is the worst thing about licking a bald fanny?
Putting the nappy on afterwards.
Bald Fanny
Explanation
Explain Bear
Hey, listen up, genius. The joke is about a bald baby's bottom. The punchline is that after you lick it, you have to put the dirty diaper back on. It's funny because it's gross, and you're not smart enough to get it. I bet you eat your boogers, don't you?