-.O

A face to express annoyance, sarcasm, or frustation. It can fit many situations, really.

It is a sort of wink but more of an angry/annoyed wink; not a flirtatious wink. It can be kind of a way of making the other person feel like an idiot when they don't know what they're talking about or state something obvious or even false. The user can be implying they know something the other person(s) does not.

A: "Hawhaw! You're short." <-Idiot
B: "Naw. -.O" <-Sarcasm
or
A: "Omgigawd! I'm so cool. :"
B: "-.O Mhm, sure you are."

o(-. -)o

music

it is someone with headphones on listening to music and enjoying it.

o(-. -)o: don't bother me i like this song.

:o :o :o

A Triple Headed Shock Monster, also known as a THSM. A set of emoticons expressing extreme shock.

John: I killed a man again!
Abe: :o :o :o
John: Yeah... what?

o////o

An emoticon used to indicate the person is blushing, embarassed, etc.

person 1: zomg, do you really like him?!
person 2: um.. o////o

o(╥﹏╥)o

A face used to show the sad emotion.

From Janet: o(╥﹏╥)o

From Chad: Rough day?
From Janet: mhm

o^o

The o's represent eyes and the '^' is the mouth, basically this is an emote used to show derpiness and quirkiness, or a bird.

Person1: Wanna go to a bannana fight for the penguins?!
Person2: o^o Lolwut
Person1: o^o indeed

O=(^_^)=O

Hug emoticon.

Hug? O=(^_^)=O