The list at least seems to have its tongue firmly in cheek about the mission of the document. “This list has about 2800 entries you should find useful in your work or for keeping up with your children or grandchildren,” the document states.
I can’t help but imagine the discussion that went into building this list, which lists decidedly non-slang terms like SQL (a popular database technology) in the same breath as BTDTGTTSAWIO (“been there, done that, got the t-shirt and wore it out,” a phrase that basically only gets used on the internet when this list resurfaces). But it’s worth remembering that this was someone’s job—the Directorate of Intelligence’s Intelligence Research Support Unit, to be exact. And one presumes that the FBI didn’t know what, exactly, was going to become the next YOLO, so they cast a wide net, just in case an important piece of slang became their next important piece of intel.
Is this a decent FOIA request, or the world’s greatest FOIA request? I humbly submit that it might be the latter.