:o 

The act / face of being surprised.

OMG I didn't know he did that! :O

:o by Jak Dude May 5, 2005

:O 

what one looks like when one inserts a cucumber up one's ass.

:O There are assorted vegetables up my anus! :O

:O by Bastardized Bottomburp March 18, 2003

:o 

A facial expression that is surprised. You can use it instead of a emoji.

:o

:o by Best cat lover meow March 19, 2017

:O 

When something cool happens.
The way of expressing a gasp through text.

Tom: Hey Josh, I finally got a girlfriend!
Josh: :O

:O by I_don't_fuckin_know August 7, 2021

:O 

best smilie in the world

OMGASH :o

:O by IRC Masta November 18, 2003

:O 

An emoticon showing that you're ready for oral penis insertation.

:O I'm ready.

:O by orf October 27, 2002

:O 

Whore with mouth wide open
see also :P

she was :O and I was :P so we 69'ed

:O by DaMan November 28, 2002