Australian term popular in the 70's and rarely heard now. Not without it's peculiar Oz charm and used in a fairly benign manner to tell some charmless, or possibly, devilishly charming lair to get a move on.
At the local, a boyishly handsome wag is eyeing up the pretty barmaid.
He not so subtly makes it clear to his mates that she is rather attractive, and completely at his mercy.
Wag: Patty has splendid breast definition, wouldn't you agree?
Sniggering round of agreement from assembled uglies.
Patty: Oh, Rack off Normie! You and your mates!
Giggles all round from the ladies, and rounds of applause from the gents.