When the word sick doesn't fully explain the sheer awesomeness of a certain thing, condition, or situation. It is used to expand on the popular term by expressing how something is actually sick to mind bottling proportions.
A particular feeling of exasperation felt after either listening to the fuckery that is David speaking or after being in the presence of David for an extended period of time.
Person 1: David won't stop sending me video's of people dying from 4chan.
Person 2: Fucking David...