British expression for a head butt, in street brawls or (illegally) in boxing matches, to break a nose or open a cut. "Nut" is standard British slang for head.
When Henry Cooper, famed British boxer, learned an old foe had died, he commented: "He was a dirty bastard. He liked to put the nut in."
by Nick Cusa June 29, 2011
Get the Put the nut in mug.