Shorthand for What The Hell, WTH is used in text communications when expressing confusion. Below is an example of how this could be used in chat.
User1: jo ,u ms,r od msyjsm
User1: Oops sorry my hands were offset.
Note: Although typically shorthand for "What The Hell", WTH can also be short for "When The Hell", "Where The Hell", "Who The Hell", or "Why The Hell."