What Does /O/ Mean? (Using /O/ Online)/O/ means "Happy".
Definition for /O//O/ means "Happy". 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)