Nonsense; foolish talk; empty chatter or ridiculous ideas.
American slang from the 1840s-50s, combining flap (something loose and flapping) with doodle (meaningless marks or sounds), creating a word for pointless, rambling speech.
Flapdoodle captures 19th-century American irreverence perfectly—it's the kind of word miners and frontier folks would use to dismiss somebody's tall tale, and it's survived because it just *sounds* dismissive and funny.
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