BST
But seriously though
Example
I know I was joking earlier, BST I do plan on following through with that

Related Slang
srs | Serious |
srsly | Seriously |
tho | Though |
IDS | I'm dead serious |
RYFS | Are you freakin' serious? |
LBVS | Laughing but very serious |
AYS | Are you serious? |
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.