Mess  —n. 1 dirty or untidy state of things. 2 state of confusion, embarrassment, or trouble. 3 something spilt etc. 4 disagreeable concoction. 5 a soldiers etc. Dining together. B army dining-hall. C meal taken there. 6 domestic animal's excreta. 7 archaic portion of liquid or pulpy food. —v. 1 (often foll. By up) make a mess of; dirty; muddle.