An emoticon intended to appear as a blushing
person, the 'O's being eyes and the slashes (///) being the
blush, similar to how it's represented in animes and cartoons.
It can
mean someone is flustered, embarrassed, and more things associated with blushing.
This emotion can also be shown as O\\\O, O\\O, O//O, O//o, O\\o, and more similar variants.
Person A: Do you have a crush on him!?
Person B: Ehmm. O//O
Person A: I'm pretty sure
Jason heard about what you did before you sobered up at the party last
night.
Person B: Oh god. O///O. Kill meee