Why do ppl say ‘inb4’?

[Alfred Pennyworth]

Whats the purpose of this phrase?
Simply that the person can predict sth will be mentioned?
Or is it a way of saying ‘i know what you will say and has a counter to it so dont bother posting it’?

 

[NarutoB]

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Inb4 lock

 

[Wabbit]

Why do ppl use literally literally