look up any word, like porb:
 
1.
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
 
2.
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
 
3.
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
 
4.
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
 
5.
Short for male pregnancy. Men are sometimes pregnant in slash fiction stories.
"What's an mpreg?"

"When a man is pregnant."
by AempoleonM September 03, 2011
 
6.
in fanfiction, a male pregnacy.
Author's notes: includes m-preg, so you don't like, don't read!!
by The Cloaked Schemer May 06, 2008
 
7.
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