It’s been answered a bunch of times in various forums, but what the hey:
Opal is OpalCat, a member here since the beginning of the straightdope.com board, and before that a member of the Straight Dope community on AOL. She lives in suburban DC, manages a thriving Internet business that includes Fathom.org and TeemingMillions.com, boards unofficially related to this one. (See the disclaimer here and there about how there’s no official connection between the boards and no legal liability on the part of the Chicago Reader, Inc. for those other boards.)
A long time ago, Opal made a remark in an AOL thread that she’s long since come to regret, to the effect that a list should have at least three items; a list with only two items is not really the right way to express those two things. This led to someone wanting to list off two things writing:
- The first thing
- The second thing
- Hi Opal!
in order to have a list of three items – and it took off and hasn’t stopped in nearly six years. Notably, people have taken to including “Hi Opal” as the third item in a multiple-item list, finding humorous ways to incorporate a reference to Opal as the third item in a list, etc.
Actually, the three words which end in “gry” are:
- Hi Opalgry
When come back, bring a 1920s style death ray. I burning your dog! Gotcha ya!
(Somebody make it stop!!!)