The group of followers of Stephen Colbert (host of The Colbert Report) who act on suggestions made during the show. The term was first used on the talk page of the Wikipedia entry for elephant, after Colbert called for the entry to be modified to reflect a (fictitious) three-fold increase in the elephant population. The Colbertistas are said to engage in Colberrorism.
The Law of Colbertity states that Steven Colbert is so awesome that if he were to become less awesome, he would only become more awesome, and if he were to become more awesome he would become less awesome. This is caused by the fact that Colbert is the highest point of awesome, there is no match to his level of "Awesomeness" and there is no exceeding his level due to the limitations of the English word "Awesome." If he were to become less awesome the peak of awesomeness would lower with Colbert.
The man who reached colbertity exploded because Stevens Colbertity was much strong than the man's.
Colberting is the act of posting a number of high-resolution images in a thread on an web forum in an attempt to make it difficult for other forum members to read, thereby either slowing or stoping the conversation occuring within it. In practice, pictures of Stephen Colbert are often used as the requisite high-resolution images, but any high-resolution images will do.
I wanted to read Kelly's tribute thread, but it looks like Mikey has been busy Colberting it, and when I opened it my browser crashed.