What Does *O* Mean? (Using *O* Online)*O* means "Surprised".
Definition for *O**O* means "Surprised". This is the most common definition for *O* on Snapchat, WhatsApp, Facebook, and Twitter. Here is some more information about *O*:
2: Quite easy to guess
Adults and Teenagers
Using *O* on a Cell Phone (SMS Texts, Whatsapp, and Yubl)