What does :-O stand for?

:-O stands for "Open-mouthed, surprised"

How to abbreviate "Open-mouthed, surprised"?

"Open-mouthed, surprised" can be abbreviated as :-O

What is the meaning of :-O abbreviation?

The meaning of :-O abbreviation is "Open-mouthed, surprised"

What does :-O mean?

:-O as abbreviation means "Open-mouthed, surprised"