Short for male pregnancy. Men are sometimes pregnant in slash fiction stories.
"What's an mpreg?"

"When a man is pregnant."
by AempoleonM September 3, 2011
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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 22, 2008
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art of cesar torres giving birth to gf from fnf even though cesars a guy and gf has canon parents. oh and mark is also there.
"cesar torres mpreg art" - person 1 (probably me)
"im gonna kill mysel" - person 2 (probably my friend whos not being named for pivacy reasons)
"im coming out as a mudslut" - ezekiel the alternate fucker
by xX_Peachy_Xx July 2, 2022
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