O.K.

Why do so little people wonder about the origin of the term 'okay'? It's weird because we use it so many times a day, and people around the whole world use it, in many different languages. Yet, nobody asks himself where it comes from. Neither did I, until last night, when I was lying in my bed and thinking of K.O. and T.K.O. (Knock Out and Technical Knock Out). Suddenly I realized that I never heard an explanation of where the word O.K. came from. I was too lazy to get up and look it up, but it was the first thing I did in the morning. Here's what Wikipedia has to say about it, okay? Many different theories, which one makes most sense to you?