One of the mysteries of the English language finally explained.
(A) As an introductory or terminal tag in a question or command, inviting assent or compliance (often without the expectation of reply): ‘eh?’, ‘isn't it?’, ‘won't you?’. (b) Parenthetically, as a general conversational filler or intensifier: ‘really’; ‘you know’, ‘I mean’.
1940s. Representing a colloquial pronunciation of no [interjection].
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