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".