M.P.

An acronymn for Man Period. Like when a man is acting like a women on their period. Extremly moody.
You and the guys are out at the bar and one of your friends leaves at 8:00 PM afterwards you and your other buddies are talking when one asks "Why did Andrew leave so early?" and you say "I don't know he must be on his M.P."
by Iamkrizzkaliko December 27, 2009
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