'Jersey Shore' Italy Trip -- Italian Group FURIOUS!

The "Jersey Shore" road trip to Italy will only serve to make the locals look like "buffoons and bimbos" ... this according to a very pissed off Italian-American organization. 

A massive Italian American interest group -- who tells us they're furious with MTV's decision to shoot Season 4 in the old country ... saying, "People used to go to the circus to see the freak show – that is what this will be."

The rep adds, "It will not only hurt Italians but all Americans … their outrageous, reprehensible behavior will make us look like buffoons and bimbos."

As TMZ first reported, UNICO was the first group to call for a boycott of the show -- claiming it's a "denigration" of Italian Americans.