The term 'STY SUPPER' is a phrase used to describe a meal that is of low quality and not very appetizing. The two crossword solutions for this term are 'SWILL' (5 letters) and 'SLOP' (4 letters). Both words refer to food that is of poor quality and not very tasty. 'SWILL' is usually used to describe liquid food, while 'SLOP' is used to describe solid food. Both words are often used to describe food that is served in a prison or other institution.