MOGAI: marginalized orientations, gender alignments and intersex
it’s an alternative label to lgbtq+, that afaik aims to be more abstract and include all queer people from the get go. unlike lgbtq, which only lists specific identities and therefor has to be extended all the time to include everyone, to the point where you for example can get LGBTTQQFAGPBDSM.
mogai is also a (mainly online?) queer movement, from which the term originates and i think it lost a lot of popularity, if it ever had that much, which is probably why u didnt hear of it.
there are arguments for and against the use of mogai over lgbtq+. i dont really care and just say queer :3