When a male ejaculates into the center of his partners back and has it slide down their partners back, down the butt-crack where it is then slurped up by yourself or a third person.
Dude you should have seen it Chad had Jason give his girl an Australian Waterslide at the Party last night.
by 95Nobody23 May 9, 2023

Someone who puts a block of caramel on your toes and sobbles on it while playing 'Never gonna give you up' in reverse on a TV that is upside down
˙ɥsnq ʇuǝpᴉsǝɹԀ uɐᴉlɐɹʇsn∀ uɐ ʎq qoɾ ǝpᴉsuᴉ uɐ sɐʍ ƖƖ/6 is australian for toe sucking
by Gameify January 16, 2024

One bites the concrete curb. The Australian mafia brings 7 kangaroos to each individually stomp ones head into paste on the curb. Then the kangaroos could consume the mutilated corpse and the Australian performs the sacred ritual involving boomerang penetration.
by Widened.urethra July 24, 2018

When a man and woman contract their pelvic floor muscles during penis-in-vagina intercourse, causing the vagina to tighten and the penis to harden at the same time, thereby squeezing down on each other as if to perform a handshake. Called “Australian” because it occurs “down under”—beneath the belt.
Johnny: Tiffany and I just completed our business transaction with an Australian Handshake!
Ted: Why was it an Australian Handshake?
Johnny: Because she was a prostitute.
Ted: Why was it an Australian Handshake?
Johnny: Because she was a prostitute.
by bobeatsfanblades March 26, 2024

The Australian headbutt is the act of smacking a man in the testicles with another pair of testicles. This act is a descendant of the Egyptian Sand Goggles.
by Ripn888 October 3, 2021

When one man squats over a bowl while another man kneels in front of him gagging to his balls. As the man squatting nearly reaches climax he has to projectile squirt diarrhoea out of his anus into the bowl and simultaneously as he ejaculates the man kneeling has to coat his hand in fecal matter and splatter the excrement on the squatting man’s chest as he takes his balls deep in his throat.
by Puppington July 12, 2025

An Australian waterfall is the act of marinating a juicy t bone steak in a lady's period blood and proceeding to barbecue it.
by Pooh bear's constipated rectum January 19, 2014
