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"to dismiss lightly and contemptuously," 1827, a slang reduplication of dismissive expression pooh. Among the many 19th century theories of the origin of language was the Pooh-pooh theory (1860), which held that language grew from natural expressions of surprise, joy, pain, or grief.
To dismiss lightly and contemptuously; airily deprecate; deride: I don't poopoo his talent, just his character (1827+)