Every now and then the subject comes up: What does "hi hi" mean and how did it originate? Here's the answer I find on the web and it is basically what I always hear: "It is ham radio laughter. HIHI, sometimes HI, other other times HIHI. It's origins are in CW (aka Morse Code), not voice. In fact, I believe old-timers might think it is silly to say HiHi or something on SSB or other voice comms when you can merely laugh if something is funny. But, with Morse Code, laughter is not in the alphabet so HIHI gets the job. In Morse code, this is "di-di-di-di di-di di-di-di-di di-di" -- and the pattern is supposed to vaguely sound like laughter (I think very vaguely)." Maybe. Okay, maybe this is the correct explanation. However, I am unconvinced. I am unconvinced because "hi hi" in code doesn't really sound like laughter. I also have another, I think better, explanation to offer. My explanation is this: "Hi hi" is not, in fact, "hi hi" at all. In reality, it began as "hee hee", but the impatient sending fist, not wanting to put proper spacing between the two e's in "hee", runs them together so that they sound like an 'i'. Before you know it, people start thinking that what's really being sent is "hi hi", and so that's what they begin sending. Eventually then people begin asking, "What does "hi hi" mean? And here we are. Hee hee!