FlyerTalk History and context lesson:
Yes, the "do" part of the Catman Do was always used and derived from it's proper context as defined in the dictionary meaning party, but there is more to the story...
And that began with the "Catman Do" which was a play on words of the name of the famous capital of Nepal...Katmandu.
"Catman Do" meaning
Catman's party.
After the successes of the Catman Do's, the word "do" sorta just became synonymous with FlyerTalk parties in particular, with many other folks calling their get togethers "do's" as a "tip 'o the hat" to the Catman Do's. Just as "PIPs" became synonymous with large organized FlyerTalk gatherings after the success and popularity of the
Party In Paradise of 1999.
And
that's what I think
doc meant when he attributed the "do's"
of FlyerTalk to
Catman.
So, the word "do" did not originate on FlyerTalk, of course. But it's popular usage to describe FlyerTalk-specific get togethers, did originate with the Catman Do's.
BTW, the second Catman Do was called the Catman Do Deux. Deux being French for 2. Catman Do Deux being pronounced as Catman Doo Doo, or Catman Poop.
There will be a quiz on this next week.
And
pinniped...Thank You for your question!

For more information, you can read about the last Catman Do event, the Catman Do Trois, at:
http://members.aol.com/millionmileflyer/catmando3.html