The act of sticking both index fingers into a woman's vagina, then when she is not looking shoving them into her ears and using them as handles to receive oral sex.
Jim:dude, why is Sarah so pissed at you?
Bob:Well, I fingered her and when she wasn't looking I gave her an AustralianWet Willie!
in the same family as a "wet willie", but instead of licking one's finger and penetrating another's ear, one would directly penetrate their tounge into another's ear in order to directly transfer the saliva.
Donna: he thought he was being sexy by licking my ear, but he kinda gave me a direct wet willie Kimmy: ew, so sloppy