It has, but in 1967 I was 5 and MTM's character was called Dorothy, and every time one of the camp Chinese guys introduced someone they said it's OK they are a friend of Dorothy's, and my Uncle who was born in the 40s and was clearly of a theatrical bent in his teens and 20s said he had never heard it before the film, though I imagine the scene in Glasgow was not huge or cosmopolitan. I have also heard it is from Road to Oz the sequel to Wizard of Oz.Has it occurred to you that perhaps they were referencing "Wizard of Oz" in the play and film, which was made some years prior to "Millie"?
It was fairly common parlance before 1967.
Oh but I have, not as recently as I would if I wasn't getting Buddhistic in me old age it has to be said, but I've never resorted to scoundrel's tricks like knuckledusters...a good kick in the balls is quite sufficient ! I actually have a knuckle 'missing', little finger, left hand pinkie, because years ago rather than punch an utterly psychotic gf who had wound me up to my wits' end I punched a wall instead of her head.Youve obviously never punched anyone.
Break every bone in your hand with that on....