Rosie is from the East Coast, and went to College in Boston before dropping out.
In that part of the world it is a bit of an insult to be called a "clam digghhaa" as they would pronouce it, as one of the definitions from the "Urban Dictionary" denotes:
An occupation: Any person from Massachusetts, typically, that harvests clams at low tide in the clam laden inlets. An article of clothing: Pants that are worn by those digging clams. They are cut off 6 inches below the knee and resemble "High Waters" but have no apparent cuff or taper. 1: It's low tide, let's take a ride by the inlet and see if the Clam Diggers are out. 2: Dude, why the *** are you wearing Clam Diggers? We're goin to pick up the ladies, not the beach."
While technically you are correct, I was referring to a different sort of clam digging...