Definition of Post Toasties in US English:

Post Toasties

(also Post Toasty, Post Toastie)

noun

US
  • 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.

Origin

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.

Pronunciation

Post Toasties

/ˌpəʊs(t) ˈtəʊstɪz/