irishslang.info

to lose the head is to lose control in anger

 

"mate! will you just back of before I lose the head!" 

irishslang.info
Go away you silly person
irishslang.info

You are quite un-attractive

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Go away
irishslang.info

To Fight/Assault

 

e.g. "He belted him round the neck!" 

irishslang.info
to deal with in a violent manner, to strike percussively
irishslang.info

 

I will smash your face in

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Generally calling someone a mouthpiece because they just got served verbally or physically!

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I'll sort you out now