slumper

noun

1. A person who slumps or slouchs; a sloucher, drooper.

   “Then, as soon as you walk away from the mirror, you slump into the old comfortable position, with the result that your hemline sags forlornly down in the back. If you’re a slumper, might as well face facts and stand that way when your clothes are being fitted, then allowances can be made for droop-osis. But do something about it, won’t you?”

   “Good posture is far more important than many of us realize. If your posture is already good, you are likely to gain better initial respect from your students than if you are a slumper or if your posture tends to be rigidly erect. This is a matter that you can do something about with a little conscious effort.”

   “Are you a humper or a slumper?”

   “Is there a real difference to the way people sit? Ask a woman who has been sitting at her desk all day. The expression on her face will be answer enough. A look of pain or discomfort means she’s probably a slumper. If she smiles and shrugs, then the lady most likely sits comfortably tall.”