There are a number of definitions, all of which will seem familiar to longtime students of Round John.
We liked this one:
1. A terrorologist certified by his own certifying agency
Dude did you hear about that Idema guy?
Yeah- he’s a real Giduck.
It’s technically wrong, because Idema was a real Giduck. Now, he’s dead (Idema, not Giduck. Giduck is still alive and young enough to repent and reform). But we get the point.