You probably typed this because you were bored and therefore clicked on the first link on your search engine which is how you are reading
this and you probably know what it means, If not, then continue reading
It means to be suprised, like this ---> O.O <--- (eyes open wide)
Or to be looking at someone in a "one eyebrow up" kind of way like this ---> O.o <--- (It may be flipped to this ---> o.O <--- although It does means same thing) it's a way of saying "whaaat?" or "I don't know what you're talking
about" or even "don't look at me, I don't know!"
Or it can mean "I'm confused
and don't understand the current situation
" like this ---> o.o <--- (eyes wide open but sort of small and hidden) this may be due to confusion or maybe simply trying to look cute.
Hope this helped...Everyone has their own opinion
of what it means :D <---Happy face haha :D