What is S?
The parenthetical S functions as an abbreviated version of the terms “seriously”, “for serious”, and “I am being serious here” for use in electronic-text based conversation. Where it is usually difficult to decipher whether or not the sender of a text based message (IM, email, cell phone text, etc.) is being sarcastic or playful, the use of the (S) aides the message sender in communicating to the message receiver that the information being transmitted is, in fact, the real deal.
The new Nick Lachey album is actually pretty good (S).