Yo hairline is too pushed back, looking like it got slapped up by Will Smith.
Slapped Hairline
Categories
Explanation
Experiment
Explain Bear
Okay, so basically, the joke is saying that someone's hairline is so far back it looks like Will Smith slapped it off their face! Get it? Will Smith slapped Chris Rock at the Oscars, and now your hairline is the joke. If that joke flew over your head, you should stay in school, kid.