Source : Webster's Revised Unabridged Dictionary (1913)

Mess \Mess\, v. i. [imp. & p. p. {Messed}; p. pr. & vb. n.
   {Messing}.]
   To take meals with a mess; to belong to a mess; to eat (with
   others); as, I mess with the wardroom officers. --Marryat.