Other forms: headbutting, headbutts, headbutted
To headbutt is to hit somebody with your forehead. Headbutt him, headbutted in the face, a headbutt.
Done properly it uses the hard front of the skull against a soft target, and done wrongly it injures the person throwing it. It is a criminal assault everywhere and a sending-off offence in football. Note that the word is also a noun for the blow itself.
1verbheadbuttTo hit somebody with the forehead.
“In the bar fight, one man headbutted the other and broke his nose.”
headbutt is a blow.
Head plus butt, the verb meaning to strike with the head, from Old French boter, to push.
From head + butt.
Etymology from Wiktionary, CC BY-SA