vetruvian whopper
A large mythical beast fabled as serial killer of other mythical beasts. Basically, the biggest badass thing around...

Termed as a noun for objects, people and tasks that pose a great challenge.

Often spoken with an Australian accent to provide suspense and gravitas. Also used in conjunction with phrases such as "crikey" and "flippin".
Bob: Woah... That mountain is fucking huge.

Jeff: It's flipping vetruvian whopper!

Bob: Fuck me...