This is silly. I realise that but that’s okay. The odd silliness is allowed. This expression, you piece of chicken, is a bit of a family joke. My youngest daughter coined the phrase. We use this secret coded message when someone annoys us. Being a household of three women and only one man we tend to be a bit naughty and sometimes use it when we are ganging up on the only male in the house! Wicked witches. My poor hubby!! When he does something annoying we whisper: ‘ he’s a piece of chicken,’ and giggle….