The phrase "come in, spinner!" meaning "Ha! tricked you!" has been used by Viz a couple of times, to the consternation of non-Australian readers.
It seems this usage of the phrase is yet to be covered by any of the Australian dictionaries, even though it's quite widely used. Lexicographer James Lambert has recently written a note about it on a Web page,
http://www.anu.edu.au/andc/res/aus_words/lambert/lambert_more.php, but he was only able to find one written example.
The same phrase is used in the gambling game two-up, played with coins, where it means that all the bets have been placed and the coins can be tossed. But it's not totally obvious why this should have come to mean "You've been duped". My own hypothesis is that there might have been an influence from fishing. Another way of expressing the same idea is to mime an angler reeling in a line, and a spinner is a type of fishing lure, so maybe people felt the phrase
come in, spinner suggested reeling in a fish that's been fooled by a lure.
In any case, it's a good phrase, and quite apt sometimes on the forum.