HA!! I'd be more easily vulcanised than Americanised, Jan!!
https://www.youtube.com/watch?v=fGr0Ko0f4Tg
See? It's one of my fave lines from The Castle! Daryl says it to the opposing lawyer when he wins his case in the High Court. Maybe it's a Vic or Tassie expression, not so familiar in the great NSW?? I grew up hearing it (and saying it!) all around me. One thing I learned travelling round the land for years is how idioms change from state to state, though the accent hardly varies.