threadjacker 

A person who intentionally changes the topic in an email or bulletin board thread.

"Jeff was trying to tell everyone about his new computer, but Mike turned it the thread into a conversation about operating systems. Jeff got threadjacked bad; Mike is a serial threadjacker."

threadjacker by Caroline Sanford December 10, 2007

Threadjack 

To take over the content of a message thread by changing the subject of discourse to a topic outside the purview of the original subject and/orforum, while maintaining the subject line. A form of amusement for trolls. Threadjacking is distinguished from flaming, as flames are a quasi-personal attack on a poster or on a poster's style of discourse, where threadjacking is deliberatly steering the discussion offtopic.

Arm4war keeps starting threads about how fighting style affects gameplay, but artboy keeps threadjacking his posts with rants about non-real world physics.

Threadjack by alphageek December 11, 2003

Threadjacks 

Third person singular of threadjack

No one threadjacks our forum on the possibilities of inter-galactic peace through (extremely impressive) multi-part harmony singing!

Threadjacks by lcdn July 13, 2006

Threadjack 

Definition:

To hijack the engagement arc of a social media thread—usually via a high-impact comment that pulls attention, likes, and replies away from the original post. A threadjacker shifts gravitational focus, often triggering Screenshattin attempts and clout siphoning.

“He dropped one line and threadjacked the whole post—now everyone’s replying to him instead of the original video.”

Threadjack by Wordwrecker September 2, 2025