The Rice University Neologisms Database

insulting term for a person with lower intelligence I was teasing a friend about her feelings for a boy, and she jokingly called me an igmo, which is short for ignoramus. It is easy to see how this long, SAT style vocabulary word was shortened to sound “cool.” It also sounds smarter than calling someone stupid or dumb. I am not quite sure how the n changed to an m in the shortened version. When spoken quickly, the two sounds are very similar so perhaps the m sound flowed more easily. Also, the two letters can probably be used interchangeably since they are so similar.