"Adiumy" is what the duck that represents Adium's default icon is called.
See two blog posts by Adium's former Project Manager Chris Forsythe:
Also see a blog post by one of its authors, Adam Betts:
The colourful nicknames of two further Adium components also relate to this species:
- the Status menu item is called "Evil Menu Duck" (EMD) and
- the Adium Crash Reporter has been named "Burning Duck".