Big-ass forehead
The kind of forehead that few people have because most people have small-ass foreheads. People who have them are often made fun of by dense failures of society who have nothing better to do with their free time and refuse to see their own (obvious) flaws.
Damn, that girl sure has a big-ass forehead.
big ass forehead
someone whos forehead is not a normal size
sean gonna have a big ass forehead when he gets a buzz cut
Big forehead ass nigga
'A big ass nigga with a big ass forehead'-Stevie Wonder
Kick that big forehead ass nigga in the doo doo!