blockhead machine 

a box of some sort which is placed on the head and is rotated vigorously in order to ruin the hairstyle of the victim- thus giving them A blockhead.

There is also blockhead resistant gel that can be worn to protect ones hairstyle.

Oh that Moonhead has got a proper blockhead after we got him with the blockhead machine! he's been merked

blockhead machine by Sie n Grev October 9, 2007