This meaning refers to a place or collection of things that is dirty, untidy, or disorganized.
Your room is a complete mess.
The children left a mess in the kitchen.
This figurative meaning describes a complicated situation that is difficult to solve.
The project is in a terrible mess.
His financial decisions created a serious mess.
In military use, a mess is a dining facility or social group for service members.
The officers ate breakfast in the mess.
Dinner is served in the army mess at six.
