Tu sors!

About

Tu sors ! is a French slang, meaning Get out! in English, widely used both online and offline as an interjection and a response to a very lame joke. Its use on forums, chatrooms and messenging systems, coupled with image macros, is meant to highlight when someone (most of the time called boulet, a French slang for moron, see noob) is seen as acting moronic, annoying or plain lame, and to invite them to leave, in a similar manner as the Get Out Frog. The slang can also be seen as an emoticon drawing of an arrow with a door: ===> [], a short command to play on the French Idiom prendre la porte, synonymous as to leave, to quit.

Meaning

Tu sors !'s expression doesn't have an online origin. Actually, according to most of the answers gotten from people asking for it, it comes from a common interjection used by school teachers to expel noisy or disrespectful students from their classroom.
It then expanded on its own as a common occurence to use in any situation to point at someone who is acting annoying, lame and so on, as the following French advertisement from 2006 shows:

Fédération Française d'Ordre de Sortir

Online, in the early 2000s, an imaginary group calling themselves Fédération Française d'Ordre de Sortir (French Federation of Allowing to Get Out), or FFOS for short, was launched as a way to gather people willing to create image macros in order to help forum administrators and moderators dealing with newbies and/or annoying users in a funny way. The group was supposedly created by someone name Wolfpro and its vice-president, Kamiku, made the website as early as September 14 2004, even though a 2003 thread on jeuxvideos.com shows presence of a previous website that is now defunct.
As more people came along uploading pictures, an official Facebook group was later created.

Single-Serving Websites

• Toi, tu sors!
• Toi, tu sors
• Tu sors !
• Tu sors forum

Ok, je sors

A slang response also exists and is used to excuse oneself when they are caught saying or doing something considered annoying, lame or uninteresting. By adding it at the end, Ok, je sors acts as a way to tone down one's mishap and to add comical relief to in order to escape from an awkward silence and the tension that may ensue. Present in emoticons, the slang is often coupled with the drawing of an arrow and a door in order to depict the action of leaving the conversation.