(Noun) An abnormally large cranial dome exhibited by top quality NFL linebackers.
Did you see the Falcons versus the Steelers? I am surprised there was enough room to play with James Harrison and Sean Weatherspoon's linebacker heads.
adj. (American *fluff*, slang foof. "Fluff in the brains"; not thinking straight) : chiding term for awesome people who are slacking. Usually used for absentminded close friends and loved ones.
n. : Someone who is foof-headed.
"He is being quitefoof-headed today."
"Stop that, you foof-head."