A frivolous or insignificant person; a foolish or contemptible individual.
Origin uncertain, possibly from 'dunk' with reduplicative '-adoo' suffix common in American slang. Likely American English colloquialism from the early 20th century, though the exact derivation remains unclear.
This word captures the playful dismissive tone of early 20th-century American slang—'dunkadoo' sounds funny on purpose, which is why people used it to mock someone without being too harsh.
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