What Does Mpreg Mean?
Content TermShort for 'male pregnancy' — a genre in which a male character becomes pregnant, via magic, science fiction, biology unique to the setting, or simply authorial fiat. It is a long-established niche with dedicated tags.
Mpreg in Practice
Mpreg predates AO3 by decades, appearing in zine-era and early internet fandom, and it ranges in tone from domestic fluff about expecting parents to body-horror-adjacent drama. In omegaverse settings male pregnancy is often built into the worldbuilding, while other fics use magical accidents or experimental technology as the mechanism — and many skip the explanation entirely. The genre is polarizing, which is precisely why it's so consistently tagged: readers who want it can find it instantly, and readers who don't can exclude it just as fast. For some fans it's also a meaningful space for exploring gender and parenthood.
Example usage
"The tags said established relationship, mpreg, and 80k of domestic fluff, and the comment section was thriving."
Related Terms
Omegaverse
A shared alternate-universe framework, also called A/B/O, in which people have a secondary biological designation — alpha, beta, or omega — that shapes social hierarchy, instincts, and reproduction. It is one of fandom's most widespread invented genres.
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Domestic Fluff
Fluff set in the soft machinery of shared daily life — cooking together, lazy Sundays, falling asleep on the couch. The genre where intimacy looks like dish duty.
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A/B/O (Alpha/Beta/Omega)
An alternate universe genre, also called Omegaverse, in which people have a secondary gender of Alpha, Beta, or Omega with distinct biological and social roles. It typically explores pack dynamics, heightened instincts, and hierarchy-driven relationships.
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