Acronym for "poor me organ".
"that little voice, that twinge of doubt
in your chest is your pmo. And that
son of a bitch is a liar everyday, even if its one small step, you work towards ripping that
son of a bitch out and throwing it to the lions. EVERYDAY, no excuses, never quit. Once you beat your PMO, you're unstoppable. More guys flunk ranger school from mental stress than physical. Discipline and drive is above muscles every day. Doesn't matter if you feel tired, sick, sad, it's your PMO. You say "fuck you" and finish the mission. Period." - a wise buddy of mine.