(transitive, often used with "up") To make untidy or dirty.
(transitive, often used with "up") To throw into disorder or to ruin.
To interfere.
This doesn't concern you. Don't mess.
(used with "with") To screw around with, to bother, to be annoying to.
Stop messing with me!
To take meals with a mess.
To belong to a mess.
To eat (with others).
I mess with the wardroom officers.
To supply with a mess.