:O 

The 'O' face - in referrence to the face one has during a orgasm.

Movies that refer the 'O' face: Office Space

:O by Joel Costa - Shoeboy July 17, 2003

"o" 

"o" is put in place of the letter o in words that have "o"rgasmic meaning.

that guy made an "o"ragami of a pair of boobs!

angelina j"o"lie is so incredibly hot

"o" by pecker_snot June 3, 2004

//.o

The emo emoticon. the two slashes // make up the infamous emo swoosh. the period makes the nose and the o makes the other, or perhaps, the emo's only eye.

alt:
// are is the emo swoosh
. is the one visible eye
and o is the emo mouth saying "Woe is me."

me: Go kill yourself
emo kid: //.O


me: dude, i totally banged your girlfriend last night
you: //.o

//.o by omgitsmeandnotyoulol2 October 30, 2008

/o\ 

Emoticon variation of an emoji "see no evil"(🙈)

"Oh my you make me blush! /o\"
"Aww, that's so cute of you /o\"

/o\ by Feathercraft_ August 8, 2021

:o) 

chode-nosed cretin

:o) suck my small, hairy nose

:o) by Bastardized Bottomburp March 18, 2003

'@O

It's a french horn smiley

(status update) I'm playing a french horn at the concert tonight '@O

'@O by Slurpeee February 21, 2011

\O? 

This is an emote of a guy with his hand raised in the air and his other hand behind his head, confused at what's going on.

That blonde girl in the back was \O? to the teacher the whole time...annoying but man she's damn hot though.

\O? by AKewllName May 20, 2012