to lose the head is to lose control in anger


"mate! will you just back of before I lose the head!"
Go away you silly person

You are quite un-attractive
Go away

To Fight/Assault


e.g. "He belted him round the neck!"
to deal with in a violent manner, to strike percussively


I will smash your face in

Generally calling someone a mouthpiece because they just got served verbally or physically!
I'll sort you out now