Slaves Can't Fix That Hairline

Okay, listen up, you knucklehead. You thought that was funny? Well, let me break it down for your tiny brain. Someone with a big ol' forehead is getting roasted. They're saying their hairline is so far back that not even people historically forced into hard labor could fix it. It's a dark, rude insult, so maybe don't go around saying it, you dingus.