What is _o_?
n. text representation of an open or gaped asshole. Also a pussy that has been stretched.
Girl after a night with me you'll go from (_|_) to (_O_) because of my huge dong!
Means you praise someone, for saying something
There's a discussion, and someone says something which you totally agree with.
Than you say '_O_'
Means you worship someone.
n00b: how to start your pc??!!?!
normal person: Press the power butten ;)
Note: You don't have to be a noob to use _O_