Italian American slang for Blue Cheese Dressing. Yet another example of Italian Americans making up their own words by shortening and butchering the english language.
At a restaurant. "Can I have a house salad with Blooch on the side"
At a pizza place. "Yeah, I'll take a sicilian and a regular slice with a side of blooch."
the counter guy had no clue what Blooch was.
"You know, Blue Cheese Dressing"