"one who talks blustering nonsense," c. 1650, bletherskate, in Scottish song "Maggie Lauder," which was popular with soldiers in the Continental Army in the American Revolution, hence the colloquial U.S. use for "talkative goof-for-nothing fellow; foolish talk," especially in early 19c. From blather (v.) + dialectal skite "contemptible person."
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