specifically, the AUSTRALIAN snot rocket is performed after one has recieved an Australian Booger Blaster, and the resulting "rocket" is composed of both mucas and semen.
man 1: "last night i gave my wife an Australian Booger Blaster!"
man 2: "nice dude!"
man 1: "yeah, you'd think that, but then she blew an Australian Snot Rocket all over my chest."
man 2: "ew dude, you shoulda got the hell outta the way!"
man 1: "it's cool, i got the dog to lick it off."
man 2: "wow, there is something really wrong with you man."