is the word "headbutt" or is it "headbunt" ?

[keepthemhandsup]

kermit cintron thinks punches are headbutts

[Talisayen]

Head butt - to hit somebody a deliberate hard blow with the forehead or the top of the head. Like MAB did to Pacquiao when he got KTFO.
Headbunt- it's not even a word