It means go f*** my orange. It's just like OMFG but backwards. It's an insult, really. In a way, like ktm - Kiss my teeth, or stfu - shut the f*** up. It's probrably the best insult ever invented because it overlaps every insults awesomeness.
Elle says:
You should have underaged sex, it'll be cool.
Bobby says:
Gfmo. No.
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