To describe someone who has nothing behind their forehead such as a brain or a skull.
Or when advanced retard just isn't good enough.
You're such a forehead.
One of the greatest things a man will ever see
Wow look at that amazing forehead
KSI OlajideBT's biggest thing in his life
"you see that JJ geezers forehead, it's mad big ain't it."
When your girlfriend sucks your dick before you fuck her.
"I think I'll stick with Denise, she gave me some forehead last night."
Forehead is defined as Arya Ramsumair
Arya Ramsumair from chinmaya with a huge ass forehead