Mess is a state of disorder or untidiness where things are scattered, dirty, or disorganized. When your bedroom is a mess, clothes pile on the floor, books sprawl across your desk, and it's hard to find anything. A kitchen becomes a mess when flour dusts the counters, mixing bowls stack in the sink, and ingredients clutter every surface.

The word also means a difficult or confused situation. If you accidentally tell two friends you'll hang out with each on the same afternoon, you've created a real mess that needs sorting out. When someone says “this is a mess,” they might mean a physical jumble of objects or a complicated problem with no easy solution.

To mess something up means to ruin it or make it worse. You might mess up a drawing by smudging the ink, or mess up a presentation by forgetting your notes. When you mess around, you're playing or goofing off instead of working seriously.

Interestingly, mess can also mean a place where soldiers or sailors eat together, called a mess hall. Military units still use this term, so a Navy sailor might head to the mess for lunch even though the dining area is clean and organized.