An ugly, oversized, squarish, box-like house built by a low quality Italian builder. They are usually covered in fake stones, stucco, brick, or other masonry. They also tend to not fit the neighborhood, and the guineas that move into them tend to act like niggers.
P1 "Did you see that new Guinea Fort Tony and Vinny are building down the street?"
P2 "Yeah, I cant wait to see the Guinea Pison Niggers that mvoe into that dump.
P3" "That Guinea Fort is the ugliest house on the block. It looks like a fuckin' square."