dickybird
noun
1
a little bird. Childish. As in the traditional nursery rhyme, 'Two little dicky-birds sitting a wall, / One named Peter, one named Paul' UK, 1781.
2
a word; hence, a thing of little value, the smallest thing. Rhyming slang; most often given in full and usually in the negative context, 'not say a word', hence the second part of this sense. In the theatre, 'dickies' are an actor's script, 'the words' UK, 1932.► not a dickybirdnothing UK, 1975