When ending the conversation of someone else. Used as a response when trying to end a sentence or if annoyed with the other party who keeps talking.
Friend 1: I am actually so tired today
Friend 2: so ok
Used to end a conversation that you are clearly over. Can use in any situation when clearly annoyed or do not have an answer to give back. Also can be used as a word filler.
Friend 1: I am actually so freaking tired
Friend 2: so ok.