On my own
Used to reference having to do something or go somewhere by yourself.
(slacker friend): "dude, totally just got the over achiever as my partner for the history project."
(you): "yeah there wasn't anyone left in my class so looks like I am OMO again..."
(you): "dude Chelsea just asked duke to the dance!"
(best friend): "that sucks! Guess your goin OMO again."
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