* Flabber: An archaic word for "to flap," which in turn derives from the Old Dutch word "flappen."
* Aghast: Meaning "struck with terror or amazement."
The combination of these two words creates a new word that describes a state of being so surprised or astonished that one is rendered speechless or stunned.
It's a great example of how language can be creative and adapt to new situations. The word "flabbergasted" first appeared in the early 19th century and has since become a common and widely understood term.