Literally - "Private Messaged" See PM.
Often seen in online communities bulletin board/forums or chat rooms such as IRC.

One who has a mania for music.

It stands for Post Musical Depression, it's after you have a great time then it's over. Can be cured by another musical.

PMD, or Pokemon Mystery Dungeon is a story telling game that has a great story, that can be happy, emotional, and sad. Sure, it might look just like a typical Pokemon game at first, but when you play it, you'll change your mind (and probably cry at the end too). Some games in this series are also not afraid to talk about dark stuff like death and depression. Stuff you wouldn't see in a normal Pokemon game.

Put Me D, the act of getting someone(typically a friend) to introduce you to a guy/girl for you so u can get their number n stuff.

Stands for "Put Me Down" meaning to fill one in or catch someone up on current information/situation(s).

PMD stands for Post Masturbation Depression and it is the period of time after masturbation when there is no desire for sexual activites.