You use OK when you are about to give up on life.
Carl: Are you dying?
Yourself: OK
Literally just a man lying down.
Person A: “do you know what’s special about the word “OK””
Person B: “no what is it”
PersonA: “It’s a man lying down”
the DRIEST possible response (except for"no.")
Girl: omg daddy i love you omg omg omg
Me: ok