Primarilly used to describe a state of intoxication induced by cannabis (stoned) but can also be used to describe anyone under the influence of any illicit drug.
When you're hotboxing with your friend and you get so stoned that you mean to say "I'm so cheeched" but your highass says "I'm so chonged" instead. Getting this high normally takes a lot of weed. Even though it is a fuckup, it will cause a lot of laughter.