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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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 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 6, 2004
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"hey you wana get some mpd saturday night?"

"look at that crazy mofo every time he goes to the movies he chants mpd mpd"

"i remember the days when mpd cost 10$ now its more than 20 at amc"

by elsworth1 April 15, 2009
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It is the online Multiple Personality Disorder- People on the internet forums having not one or two, but multiple anonymous user IDs, where each ID expresses different views and opinions from the other ID's, while discussing the same topic or subject, as if creating an illusion of numerous people logged in and giving variant views, but all the ID's generally trying to manipulate the views so as to support the "east", except for one ID supporting the "west", obviously role playing somebody else, who he actually is not.
Rarely,teenagers may do it for fun and it is not a disorder.
1)The online MPD hype seems to be cool fun ,except for the confusion it causes and is a waste of time.

2)why do you need so many anonymous IDs on the same forum or webite? Now dont act like an online MPD!

3) Have to snap out of the online MPD fun, its sure gets addictive day by day.
by Petersonn December 9, 2005
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Hey did you see that squirrel? Yeah he’s a MPDS. Bc this is totally abt a squirrel..
by lpjaxon June 16, 2023
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