ec2-18-219-236-62.us-east-2.compute.amazonaws.com | ToothyWiki | RecentChanges | Login | Webcomic A self-referential acronym, probably pushing the point a bit too far. Expands to "Doubly Extended Three-Letter Acronym".
Some people have suggested "Twice Extended TLA". Both of these forms have the problem of not being able to add a sixth word to make a six-letter version though.
These so called 'people' clearly aren't thinking hard enough. Follow the example of dot-com and just add an E on the front of everything. The next one is MM, and so on.