When a hacker breaks into your computer and changes your sentences into mean things when you are IM-ing so that you seem like you have tourettes.
Say if you typed in "I like new haircut". The Online Tourettes hacker would type in," I HATE your UGLY haircut, its GAY!!
邮件由 email@example.com 发出。我们决不会发送垃圾邮件。