What is O_.?
1.
facial expression used in chatrooms.
similar to 
The large 'O' symbolizes a big eye looking right at you, and the little dot '.' represents the eye that is farther away, as if the face were on an angle from you, observing you closely, shocked at what you just said (typed)
"
OMG! did you hear that Brittney and Shane are going out!"
" O_. noo.....ew, really?"
"OH MAN! i think i'm gonna fail french."
"O_. that's not good!"
See 
Random Words:
1. 
What one exclaims when they are very happy.
"I am happy bo bappy that I don't have herpes!" 
Don't believe happy b.. 
1. 
abbreviated to C.S.D.
The phenomenon of being sexually attracted to all or many people within the same social/ friendship group, as opp..