The inevitable point at which Tripfags deviate from the original topic of a thread on 4chan, and convert it to talking about their own asinine topics. Most commonly done in the infernal "Brony" threads and Furry threads. Despite the content of the threads being incredibly stupid and possibly disturbing, the presence of the Tripfags can enrage users.
Tripfag Circlejerks can go by the names:
A few examples of the Tripcode users that make up a common Tripfag Circlejerk are:
♥ I Wrote Haikus About Cannibalism In Your Yearbook - OFFICIAL PRINCESS OF /b/ <33 !!a5PESLOoKH4
The last name creates a horrifying circlejerk in itself.