This is the new way of saying judgemental. At the moment it would get some kind of limiting language label to convey that it will raise an eyebrow in some circles, but in the contexts in which it occurs it is hardly colloquial. It just makes judgemental seem antiquated and stuffy.
It has been in American English since the late 1990s but has taken its time to reach us. The Oxford Dictionary of English has picked it up fairly recently and it hasn’t made it into the OED yet. We mostly spell it as judgy, as do the Americans and the British, but there is reasonable support for judgey as well.
This word seems to be instantly at home, at least in the speech of younger Australians.