Your hairline is dancing umlando.
Dancing Hairline
Categories
Explanation
Experiment
Explain Bear
Listen up, dummy! This "joke" is just saying the person's hairline is receding so much that it's doing the "Umlando" dance, which involves a lot of wild shaking and movement. Basically, your hairline is running away from your head. It's not that funny, tbh. But you wouldn't know humor if it slapped you in your big, dumb face, would you?