Malky is a Scots term usually associated with either violence or extreme drunkenness. Or both.
Possible phrases might include:
I'm gonnie malky ye!
I am going to commit violence against your person.
I'm gettin malkied tonight.
I shall consume massive quantities of alcohol and become very inebriated tonight.
It will probably come as no suprise that the latter frequently leads to the former.
Lost little nodeshell, don't be sad