Xit

Chatters may shorten "exit" to xit. This kewl abbreviation saves a character and, more importantly, looks rad.

After you know xit stands for exit, it's fairly easy to see how chatters came up with this abbreviation (x + it = exit). However, many people initially confuse xit for a misspelling of zit, which can lead to some wild misunderstandings. So, you may want to think twice before adding xit to your own slang lexicon.