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1.
Literally: Go fuck an ass in Italian slang.

Used as "Go fuck yourself!"
Hey, va' fa' un culo!
by El Diablo September 15, 2003
 
2.
Literally: Go do a ass

Va' means "you go" and comes from the Italian word "Andare" which means "to go"

Fa' means "you do" comes from the Italian word "Fare" which means "to do, or to make"

un, is the indefinite article "a" in masculine form.

culo, means behind, or can be slang for bottom, or "ass"
Used as "Go fuck yourself!"
Hey, va' fa' un culo!
by Rick Smith March 25, 2005
 
3.
"Va' fa'n-culo" in the roman pronunciation.
Like "get lost" or "get out of here"
"don't bother me"
by Daniel March 15, 2005