One of the mysteries of the English language finally explained.
In plural A trademark for: a type of breakfast cereal made from toasted maize, first marketed by Charles William Post. Occasionally in singular: a piece of this cereal.
Early 20th century; earliest use found in The Washington Post. From the name of Charles William Post, American foods manufacturer, who developed this breakfast cereal + toasties, plural noun from toasty; compare later toastie.
Post Toasties/ˌpəʊs(t) ˈtəʊstɪz/
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