Replying to a forum thread with a post that has at best a loose connection to the thread's topic, with the result that the thread starter's question gets side-tracked.
Often, the tread gets completely derailed as more forum members respond to the hijacker's post or add their own problems to the thread, which are not related to the either the original topic, nor the hijacker's topic.
When your teledildonics network connection becomes compromised by an external third party (the telehijacker) and they gain control of your teledildo. Results in loss of control of a virtual masturbation session.
"Honey, you worked me so hard last night with the We-Vibe!"
"What are you talking about...? I didn't even have my phone on me last night..."
"Have you updated the security on your phone? Have we been hacked...? Was that a hijacking-off?!?!"
When you're on a flight and the mood turns dark. You (pretend to) feel a gun in your side and you (don't really) hear a dark voice tell you to go to the bathroom. Now wank or I'll blow up the plane... says the voice in your head. mile high club rape wank
Whilst mid-flight:
"That guy's been in the toilet for a long time and it sounds like me might be crying!?!"
"Don't worry, probably just hijacking-off!".