When you blow a load on your partner's arse cheeks (preferably after anal) and then wipe it up with your pubic hair
"I was fucking this chick and she forced me to perform the Australian duster. I'm gonna kill that slut"
by Smol_Wog April 9, 2024

Similar to a wet willie or reverse wet willie. Australian implies that you stick your finger “down under” (anus or vagina) before putting it into someone’s mouth.
by SpT3 May 20, 2021

by Ms mama February 24, 2025

When you go into a public toilet stall and press against both walls, then shimmy upwards towards the roof and try and shit in the toilet from above.
by Justpulledavinnie May 29, 2022

The act of getting a large group of people, taping yourselves to the ceiling in such a way where everyone is force-fucking each other for an hour straight. Afterward, everyone must let a spider crawl on their cock.
Person 1: Hey, I got like 50 people over here, wanna join in on our "experiments"?
Chad Person 2: No thanks, I don't want to do the Australian Mosh Pit.
Person 1: How'd you know?
Chad Person 2: Because you're a virgin and I'm a chad.
Chad Person 2: No thanks, I don't want to do the Australian Mosh Pit.
Person 1: How'd you know?
Chad Person 2: Because you're a virgin and I'm a chad.
by TylerTheShiteater January 21, 2022

To receive a blowjob while simultaneously being punched repeatedly in the balls in a speedbag fashion.
by Legen dairy July 13, 2022

A sexual act in which a person smears vegemite between a woman's vaginal flaps and proceeds to lick it clean while preforming cunnilingus.
by Keons Sacarver September 13, 2020
