Six sigma is actually alive and well, and in my experience refers to a well-defined set of methodologies for production efficiency. There are certification bodies that run programs dedicated to it[2]. It might not be necessarily intelligent (akin to the ISO 9000 quality standards), but it is a real deal.
Great post. I think good teams with talented, and most importantly disciplined, people can still extract the meaning behind these terms. For the mediocre companies and teams, these acronyms and terms are just lip service to attract and fool employees.
Oh, and who could forget... The consultants! Consultants love love love these words.
I'd like to see examples of the converse -- good ideas that were killed by bad naming. Not quite an objective measure, but I feel this might be quite enlightening.
[1] http://en.wikipedia.org/wiki/Six_Sigma
[2] http://en.wikipedia.org/wiki/List_of_Six_Sigma_certification...