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The term is short for Male Pregnancy and is most often used in fan fiction to describe the surprising occurrence of pregnant males. It is most typically seen in male/male pairings, but has occasionally sprung up in other situations. Is most commonly used as an adjective.
The Arnold Schwarzenegger film, Junior, was a Mpreg film.
by For-Chan March 18, 2004
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Often used in fan fics, it is used to describe a story where a man becomes pregnant.
Draco/Harry story
Rated PG13 for Mpreg
by Boochies October 29, 2003
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1. When two males make a baby together (without the help of a female). Usually used in some kind of fanfic.
2. Not a file type
Right useage:
girl: Squee, did you hear Branden and Sean had an mpreg baby together? They're so Kawaii!
boy: What, mpreg?! Ewww.

Wrong useage:
girl 1: Hey, did you get kawaiivideo.mpreg I sent you?
girl 2: Yeah! Hey wait, it doesn't open...
random dude: ...You realize that is not a file type, right? I think you mean kawaiivideo.mpeg.
girl 2: Gosh, you're right~!
by isthisawsome_yn April 21, 2008
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The term used for a male getting pregnant,in fanfics,movies,sometimes art
Dark Humour,an amazing Hagaren fic by the talented authouress FelisDeityus,is an Mpreg fanfic.EnvyxEd
by wfsdf July 24, 2005
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A Fanfiction term for male pregnancy. Popular among females because we like to make fun of males by making them go through what we girls do when we give birth.
Girl 1 - EEEE! He's pregnant! I knew it!
Girl 2 - Revenge is sweet!
Boy - ...............
Girls 1 & 2 - Mpreg is awesome!
by Kureru Elric January 21, 2011
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