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flap off

From Wiktionary, the free dictionary

English

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Verb

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flap off (third-person singular simple present flaps off, present participle flapping off, simple past and past participle flapped off)

  1. (intransitive, slang, informal, US, almost always with about) To talk excessively, ignorantly and/or wrongly.
    Don't keep flapping off about someone you don't know.