You're so ugly, when you put makeup on, it makes you look like a clown.
Clown Makeup
Categories
Explanation
Experiment
Explain Bear
Listen up, buttercup. The joke's saying this person is so ugly that even makeup, which is supposed to make you look better, can't help. Instead, it makes them look like a clown, which is, like, the opposite of pretty. It's like saying you're so dumb, you make rocks look smart. And based on your joke writing, you are.