The famous catchphrase of the famous Aussie Legend, Isaac Butterfield. There really is no simpler way to explain it's meaning, simply put: "be a good mother fucker"
Mate: Hey Isaac, be a good mother fucker!
Isaac: You be a good mother fucker too!
this is one of the longest insults known to man-kind, and is most commonly used to REALLY piss some one off to the highest degree, often when they are a fucking whore that deserves to die -and you often say that when your gonna kill their mother
P1: you are a mother fucking idiot that should go die in a piss filled ho-
p2: YOU ARE A MOTHER FUCKING BITCH, YOU CAN SUCK MY FUCKING DICK, AND YOU CAN SAY GOOD BYE TO YOUR FUCKINGMOTHER!!!
p1: nah... wait WHAT?!
p2: *kills mother*
p1: FUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
UUUUUUUUUUUUUUUUUUUUUUUUUUCK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!