Here’s an article about the show that addresses this directly.
Apparently from that article they are going to use the term “sucked off” from the American version. (I don’t think it was ever used in the UK version.) The Australian version is more permissive with language, anyway. At one point as an exclamation of surprise someone says “fuck a duck”.
The UK version actually actually used it first.
Now I’ve finished all eight episodes of Ghosts Australia season one. After the standard pilot episode it had mostly original stories for the remaining episodes except for one with a property dispute with rich neighbors (like in both Ghosts US and UK). The series is okay, but none of the ghosts stand out as particularly likeable. And the living couple (especially the boyfriend) are pretty bland.