You have to be joking! Such a word actually exists?
The only worst one I know is zenzizenzizenzic and believe you me, it is a true word!
Okay, then let me have a go at it....hmmm, some iron in it, some fusco, which in Greek is both a bubble and a strong slap to the face...and the ending is an adjective.
fuscoferuginous:getting slapped by a someone so strong you feel you were slapped with an iron shovel. And then your face is all fuscoferuginous.
Babs, nice to see you again after so long!