BST
But seriously though
Example
I know I was joking earlier, BST I do plan on following through with that
BST definition by Slang.net - The Slang Dictionary
This page explains what the acronym "BST" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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People use BST (but seriously though) to shift a conversation back toward seriousness. This acronym signals that the time for joking is over, and the time for earnest conversation has begun.
For example, if you and a friend are discussing a serious topic, and your friend cracks a quick joke, they may use BST to signal that they're once again sharing their actual (serious) opinion. During these conversational pivots, you may see BST paired with JK, to reinforce that the previous message was a joke.