Definition of messes:
(n) :
a thing or group of things in a disagreeable, disorganised, or dirty state; hence a bad situation
(n) :
(colloquial) a large quantity or number
(n) :
(euphemistic) excrement.
(n) :
(figuratively) a person in a state of (especially emotional) turmoil or disarray; an emotional wreck
(v) :
(transitive, often used with "up") To make untidy or dirty.
(v) :
To make soiled by defecating.