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Chat-Killer 

A post in a chatroom, forum, or other means of instant messaging which causes all of those participating in the discussion to quit replying, or cause a significant delay in posts back, comparable to an awkward silence.
"The phrase, 'Hail Satan' is a real chat-killer on most Christian servers."
Chat-Killer by Bruh10293 February 6, 2019

chatkiller 

a chatkiller is someone who murders a texted based conversation by butting in and saying weird off topic shit.
everyone stopped texting after the chatkiller started ranting about potatoes
chatkiller by Anarchon March 19, 2021