A Walnut is a term used to mean an absolutely stunning girl reputed to be great in bed. A Walnut is usually spotted by her fantastic looks and long flowing hair.
A person who uses intellectual buzzwords such as "cognitive dissonance," "strawman," or "ad hominem" to make themselves sound smarter than they really are when they cannot defend their own argument. Users of these words most often do not understand the actual meaning.
That's not cognitive dissonance, I justsaw through the lines of your argument better than you did, you walnut.