Definitions of mess:

• noun:   a (large) military dining room where service personnel eat or relax
• noun:   a meal eaten by service personnel
• noun:   soft semiliquid food

  Example: "A mess of porridge"

• noun:   a state of confusion and disorderliness

  Example: "The house was a mess"

• noun:   (often followed by `of') a large number or amount or extent
• noun:   informal terms for a difficult situation
• verb:   make a mess of or create disorder in

  Example: "He messed up his room"

• verb:   eat in a mess hall
• name:  A surname (very rare: popularity rank in the U.S.: #25311)