|1.||Trip to Melbourne|
A way of saying (without attracting attention) that some manner of sexual act was carried out between two individuals, that would typically be kept private. Normally performed on the advent of ones birthday.
Bloke 1 : "Happy birthday mate, What did you get from the wife?"
Bloke 2 : "Mate, I got a trip to Melbourne"
Bloke 1 : "Lucky Bastard"