denial of context

when a thread in an online discussion becomes so dense that no one can figure out the context of any post in it.

A: what was the context, again?
B: i thought you knew.
A: Oh. A denial of context has occurred.

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to pull a Lucky from Welcome

To suddenly and miraculously come back to public view after everyone thought you were dead. (Reference to the character Lucky from the 2007 Hindi movie Welcome.)

Alice: Did you hear about Kim Jong-un?
Bob: No, what about him?
Alice: Well he just pulled a lucky from welcome!

Charlie: Why the fuck are you buying a coffin?
Dick: Oh I just want to pull a lucky from welcome.