It’s basically “Bros Icing Bros,” but a lot more extreme.
This is a compilation of NekNominations. The premise is that you drink an alcoholic beverage — or, as they say in Australia, "necking" — and then nominate someone else to do the same.
According to Twitter, references to "necking and nominating" started, albeit slowly, around three years ago.
It's likely it was started as a response or an off-shoot of a similar drinking challenge called "icing" which picked up steam in the U.S. around the same time.
The mating ritual of Aussie Bogans, who in order to demonstrate their penis length/girth and demonstrate their readiness and desire to mate with other Bogans, must chug a full beer on video, and then nominate another Bogan to do the same.
Most commonly practiced before a night taking the Commo out to Chapel Street, downing a slab at Bazza's place, or hitting the drags at Dandy.