[eru]

Sure, you can optimise for your cool in-jokes, and exclude people.

What's robotic ink?

[defrost]

Probably robotic ilk using the more common modern usage of ilk - https://www.vocabulary.com/dictionary/ilk

.. along with an unintended cool in-joke about how dogs can't type.

[eru]

Yeah, at first I thought it was 'ilk', but then I suspected that there was yet another exclusionary in-joke hidden somewhere.