a contraction for "it is" one step further than "it's"

Originates from the SED and subsequently the Perl construct for a regular expression substitution: s/REGEXP/SUBST/ will replace whatever matches REGEXP with SUBST. Commonly used in chat contexts by people with a Unix background and/or wannabe hax0rs to either correct their own previous typoes, or change the meaning of somebody else's statement.

Many people also tend to drop the final slash, either because they're lazy or because they don't really know where that expression comes from.

Prefix, indicates that you are selling something. Used in chat in some MMORPGs.

Other similar terms are:
B> buying
T> trading
S/T> selling or trading
A> auctioning

'S'hit and a 'S'hower, in that order! it's what you say to your friends when they ask how far away you are from the meeting place.

In the Harry Potter fandom, AS/S stands for the relationship between Albus Severus and Scorpius--Harry and Draco's sons, respectively. Spawned after the epilogue to Harry Potter and the Deathly Hallows was released, the term already has a wide fanbase on Livejournal. It is also called Scorpibus.

*S* aka salute, is commonly used throughout the gaming clans, usually in Counter-Strike. it is a form of greetings to the members of the clan.

Shows user is feeling confused.