Whiskey Mike means: The letter W in military phonetic alphabet is combined with the letter M to form an acronym called Walking Mattress. The term Walking Mattress is generally used to describe any woman soldier who loves to sex and would give her pants for anyone. It is very common to find these soldiers in conflict zones overseas. Because after separation from other pretty women for several weeks, male service personnel can somehow be attractive to ugly or otherwise vile females. Because they won’t get as much attention while deployed, it is easier to put them down. They are now a walking mattress. Unfortunately, and this is the saddest part. Once they come back to America, their looks and reputations will follow them. They will remain a walking mattress on the post and in the barracks. They are not unusual to find them in combat zones wearing make-up. (in Community Dictionary, added by Stylobate)