I'm fairly sure this program exists, but I don't remember what it was called.
There are a few drop-down terminal programs (guake, yakuke, tilde), and I've been a fan of guake for a while. However, since I discovered GNU Screen I've been more interested in using Eterm. But I would like to make it dropdown/hide on keypress, similar to the way Guake does. I remember at some point that someone mentioned a program that allowed you to do similar things with basically any other window.
Unfortunately my time spent googling around for terms like "show/hide any terminal ubuntu" have been met with stupid Windows search engine spam.
Any clue where I could find the program I'm looking for?