Etymology

Chicago brick

Today it means: An ice cream variety, popular in Chicago and the American Midwest in the late 19th and early 20th century, consisting of a layer of orange sherbet or ice cream, a layer of vanilla ice cream, and a layer of caramel (or sometimes coffee, chocolate, or maple) ice cream. Full definition →

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The story

Uncertain, but perhaps from being a variety of ice cream popular in and associated with Chicago in which multiple flavors were compressed into one brick; the result also resembles a color of building brick which was common in Chicago at the time.

Etymology from Wiktionary, CC BY-SA 4.0.