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