MPD
MPD is Multiple Personality Disorder, when one is that fucking insane, or has that many issues, they divide themselves into different personalities, each of which has a name.
For example, from Piers Anthony's Xanth series, the Demoness Metria, who gained Demoness Mentia, or D.Mentia. (Anthony is noted for his ridiculous puns) and Woe Betide, after she acquired a soul.
by Leiko October 05, 2004

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Top Definition
MPD
Mobile Pornography Device
"Oh no! My girlfriend just died! Does anyone have an MPD?"
"Sure, here's my phone. Don't forget to delete the history!"
by B-Raeden January 10, 2012

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MPD
Multi personality disorder, or DID dissociative identity disorder, is a mental illness in which the person has 2 or more personalities inside one mind. It is often caused when a child is repeatedly sexually, mentally, or physically abused and cannot physically escape the situation.
1) Dan's daughter was raped so many times when she was very little, she has MPD to cover up the pain.

2) Jeff beat his son so much, he made up more personalities so he could forget the pain.
by IsolatedIncident September 10, 2009

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MPD
Multiple Personality Disorder. The act of one user having multiple screennames; esp. for the purpose of being a troll.

Also used to indicate one of said screennames.
"That ass BlackJack is MPDing as Jizz Hitler."
"Yeah, I figured Jizz Hitler had to be an MPD."
by rynne June 30, 2004

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MPD
Multiple Personality Disorder: An extremely rare mental disorder where a person's mind is split into two or more personalities that attention-desperate teenagers pretend to have so people will think they're unique/cool/troubled/not a loser, etc.
Andy doesn't have MPD, he's just an attention whore.
by Big McHugeLarge December 08, 2008

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MPD
MPD, stands for man period day. For the days wen ur bf or jst a male friend gets moody, lke he has a period.
Moody men = MPD
by Pheobethe March 24, 2010

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MPD
Mashed Potato Dick- when one is too drunk to get an erection.. he tries, fails, and the woman feels as if he is throwing mashed potatoes against a brick wall
Matt was sooo wasted he had MPD.
by EmilieD November 16, 2010

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MPD
Acronym for "Mega Power Dump." Announce or shout this when you are in the midst of toilet warfare.
"INCOMING MPD!!!"

"Dude, do not go in the bathroom. Someone forgot to disarm an MPD."

"I gotta go drop an MPD right now."
by hazedp May 13, 2010

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