Love the song, have enjoyed it for some time... any clue what "B.P.D." stands for? My initial Google hit seems to zero in on "Borderline Personality Disorder" ... wasn't sure if there was some canon answer (or no answer at all) that I've missed, not being around here until recently and all

No, you're right about what it stands for. Read up on the disorder and the song will make a lot more sense: http://en.wikipedia.org/wiki/Borderline_Personality_Disorder

That'd be cruel... if it wasn't close to being sooo true..ahahaha