"The Depressed Person", I guess, the text linked to above. ;-)
There are far too many acronyms to deal with, getting down into a comment thread and seeing one 3-4 levels deep didn't connect with me as one for the linked content.
Sorry, I thought TDP had been lexically bound, at least implicitly :-)
David Foster Wallace also had an annoying habit of sprinkling non-standard (or at least obscure) acronyms throughout his writing.