What is 'roid Monster?
Short for steriod monster. Someone whose overuse of steroids renders them notably different from the human norm in some respect(s). Typical characteristics include: huge gnarled muscles, bad temper, irritability, leathery skin, grotesqueness of features, puffy, constipated, pain when urinating.
The 'roid monster snarled at all who approached as he stood wimpering at the urinal.