Australian slang
An adaptation of the popular phrase: "Call a spade a spade".
The original means simply to describe the something as it is, without embellishment, as in "Let's call a spade a spade"
The more vulgar "call a spade a fucking shovel" means to state one's opinion with brutal honesty, sparing nobody's feelings, and without any regard whatsoever to the consequences.
Often used to describe boorish people:
"John is one of those people who calls a spade a fucking shovel".
The point here with the terms 'spade' and 'shovel' is that they are used to refer to the same tool. The term 'spade' would be used by someone of more refined character, and a 'shovel' by someone with fewer social graces. This appears to be a notion peculiar to Australia, perhaps arising from the British use of the term 'spade' and the notion in Australia that the English are generally cultural snobs.
Brit: I say, dear chap I wonder if you'd be kind enough hand me that spade..
Aussie: Spade? It's a fucking shovel!
I am aware that a
spade and a
shovel are not the same implement. Part of the point is that such a person would not know the difference and refer to them as the same thing.