A symbol used for showing you have blown chunks over a comment in the text or email, or referring to the fact that you got so drunk you projectile vomited.
Txt1: Dude, how wz the myspace date?
Txt2: :O------o
11👍 3👎
It is what southerners say after having some of the best intercourse (possibly even with their 1st cousins of course).
"Shoooweeee! Maybelle and me shure did fucktard last night!"