Large Forehead

Alright, listen up, smarty-pants! This joke is saying that the person's forehead is HUGE – so big that you can't even see where their hair starts. It's like their hairline is playing hide-and-seek way back there. And calling their face a "stupid forehead face" is just extra mean. It's all about making fun of someone's, uh, prominent features. You probably have a small brain, so you can't relate.