Regionalisms

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Milk shake (in most parts of the US) != Milk shake in NE.

milk shake: n.

1. A beverage made of milk, flavoring, and ice cream, shaken or whipped until foamy. Also called shake; also called regionally cabinet, frappe; Also called velvet.
2. New England. A beverage made of milk and flavored syrup, whipped until foamy.

REGIONAL NOTE To most Americans, a milk shake, that thick, sweet accompaniment to a hamburger and fries, naturally includes ice cream. But speakers in parts of New England make finer distinctions in their ice cream terminology. To a person living in Rhode Island or the adjoining part of Massachusetts, a milk shake consists of milk shaken up with flavored syrup and nothing more; if ice cream is included, the drink is called a cabinet, possibly, says food writer John F. Mariani in The Dictionary of American Food and Drink, named after the square wooden cabinet in which the mixer was encased. Farther north in New England, the same drink is called a velvet or a frappe (from French frapper, “to ice”).