Climbing the walls apparently means to be anxious or annoyed to the point of frenzy. To go stir crazy refers to any situation in which you are cooped up, like a prison. A chicken coop is a place where you keep chickens and that's where they lay their eggs. These aren't phrases no one ever uses, these are phrases I would use if I was teaching people English. Luke's English podcast airs on Tuesdays at 9pm on BBC1.