"fivehead"? That's a new term to me.
Does it refer to the V-shaped protrusion of hair in the center of the forehead, with receding points on either side, based on the resemblance to the letter V which is the Roman numeral for five? Or am I way off here?
My favorite hair-style term is the "barcode", meaning a comb-over. I'd never heard it before I came to Japan. Now when I see all the thinning topped salary-men sitting on the subway I want to grab a laser scanner and starting beeping them...