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not (hear) a dicky bird
To not hear, say, or receive a sound, utterance, or item of communication. ("Dicky bird" is sometimes hyphenated.) We've had him detained for four hours, but he won't say a dicky bird to us about his involvement in the robbery. We haven't heard a dicky-bird out of the kids all night—I think one of us should go check on them.
n. someone who performs oral sex on the penis, usually a homosexual male. (Rude and derogatory.) One of the dicky-lickers started staring at me.