An extension of the acronym imo, meaning "in my and many others' opinions". For when stating something as your opinion just doesn't get the point across well enough, and you want to emphasize that your opinion is likely the correct one. Best used when you want to sound like an obnoxious prick, without being blatantly rude.
IMaMOO, plain old salted chips taste better than the fancy flavoured ones.
de zeer0id 27 Iulie 2008