Indicates the presence of sarcasm.

When you say something and don't want anyone else's opinion and therefore neither want nor need any responses. From Facebook, Instagram and originally Twitter where you @ someone to respond.

Known as the sarcasm switch, this is used to indicate that the previous statement was used ironically.

How the grammatically-challenged make a noun plural.

What you get when you click the Urban Dictionary quick search found in the firefox bookmarks. Check out your bookmark manager, and it'll tell you how to use it, They are just pointing it out to you. If you type "slang " and then whatever you want after the space, it will search that in urban dictionary.

Used in chat programs and SMS's to infer sarcasm prior to that point.
Can sometimes be accompanied by a <s> at the beginning of the sarcastic phrase.
This is particularly useful for those who don't seem to understand sarcasm in written form, and can assist in avoiding lengthy discussions based on misunderstandings.

This weird letter that is always automatically typed in the “Word” Bar when you try to upload a word into the Urban Dictionary...