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."
by Bruh10293 February 7, 2019
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Chat killers are a series of pictures that are used to kill a chat on discord or any other online talking chats such as a cow striping on a stripper pole or a naked grinch but rather way they end up stopping the chat and ultimately kill it
by General black bunny January 20, 2019
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