A move used to inflict damage on an object/opponent. You
pull your head back and slam it forwards using the part of the skull above the
forehead to strike.
Usually you hold your opponents face
square with
one or two hands and bash them in the nose with your head.
For greater damage you hold their head with your leading hand, raise your leading foot while leaning away, then bring your leading foot back towards them in a stomping motion with the headbutt coming in right behind to gain the momentum of the stamp. This technique is used by wrestlers a lot.
Not to be confused with "butt head".