"go to do an ass" or "go to do in ass".....
But the real english translation is "Fuck you off", or may be "fuck you" i mean letterally. I say this from my 35 years old of REAL ITALIAN vaffanculo experience!.
Now other examples below..
Fuck you "fottiti"
Fuck Off "vaffanculo"
Fuck You IDIOT "vaffanculo idiota"
You piss me off! "mi hai rotto il cazzo"
Fuck you around "Vai totalmente-complessivamente a fare in culo"
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