M.W.I.A
A fancy way of saying two people got lost in a fight and no one saw them leave, probably because they were too busy fighting for each other.
They were M. W. I. A. because they fought the enemy and then fought each other.
He said he was M. W. I. A. but I saw him running off with her hand in his pocket.
They got M. W. I. A. and came back with a broken nose and a new nickname.