clandestine institutional knowledge - The phenomenon in which everybody knows the documentation is wrong and people are so pissed off at said documentation that they don't ever bother to try to fix it.  Instead new hires have to play Indiana Jones to find the two people left in the organization who have any working knowledge of the thing and beg to be trained up so they can actually do their jobs.  Normally, the newly trained individual doesn't bother to update the documentation, either.

footnote: Most of the time, nobody has the access to update the documentation anymore, which is why nobody ever bothers to fix it.

tumbleweed mode - noun phrase - The phenomenon in which all official support forums for something are either abandoned (no activity for a protected period of time), or any posts that aren't lowball questions (such as "Where's the FAQ?" or replies to release announcements) are utterly ignored (meaning, actual technical support questions).

evolving situation - noun phrase - A situation where, if all hell hasn't broken loose yet it's well on its way.

entropic debugging - noun phrase - The phenomenon in which one can spend weeks on end debugging something using a multitude of techniques, give up in frustration and/or disgust for a couple of days, come back to the project and discover that somehow the bugs have magickally fixed themselves (as verified by diffs and file hashes if one cares to check).  The phenomenon is so named due to the second law of thermodynamics, which states that entropy can never decrease, only increase in an isolated system.  In other words, as entropy increases overall in the universe it somehow wiped out the bugs in question.  See also kinetic pattern baldness.

wires - noun - Person to person backchannels.

"I had to pull some wires to get that expense report fixed before the boss saw it."

basketball mode - noun phrase - When a service or application crashes and restarts itself over and over, i.e., bouncing like a basketball every few seconds.  Considered an outage.

text message tunnel vision - noun phrase - When you get so fixated on texting that you forget that you can just voice call them.

DC AC - noun phrase (humorous) - The primary mechanism of air conditioning inside the DC Beltway.  Notionally, the movement of air due to revolving doors caused by the never-ending cycle of contractors becoming civil servants, civil servants becoming lobbyists, and lobbyists forming startups and becoming government contractors once more.