Not a blowjob. Not at all. It's like a French
kiss, but "down under." The entire
point of the word is that it's a euphemism for
cunnilingus, not fellatio.
Did you see that they used "Australian
kiss" as a word during the "Cunning Linguistics" game on On The Spot?
No I didn't. I DID, however, see that they used "an Australian
kiss." It sucks that some idiot submitted THE WRONG
DEFINITION under a slightly different name, seeing as how the name of the game is a pun on the word "cunnilingus."