Some of the words Liz and I have invented because there was a need:

• “flustrated” - of course, a portmanteau word combining flustered and frustrated. A needful word I use in the kitchen when nothing seems to be going right, pots are boiling over, the smoke alarm is going off, and I grow flustrated and babbling with every passing second.
• “irrationale” - a perfectly reasonable explanation for doing something stupid. Example: “My irrationale for eating the cookies was that I was celebrating my weight loss goals."
• “non sequiturd” - when I make a Zippy the Pinhead reply to something Liz says, but that is particularly stupid or sarcastic or obnoxious, to boot.