look up any word, like wyd:

1 definition by For-Chan

 
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