To surprise someone, to blow their mind.
The state of the Clinton team following the election.
Dear Otis,
Flabbergast is a word to describe how the upper crust of society gets offended when the hoi polloi like you and me discuss their shady business practices in terms of "dirty brackafratz" and "blasted flatterap."
You gassed so hard your flabber started to jiggle from the shockwave.
Flabbergasted
The motion your butt cheeks make when you rip a huge one
John is flabbergasting he must have let one go.
It means being extremely surprised. Like you can't believe it & shocked. When people are "flabbergasted", they usually make faces like these 👉😱😨😵😮😰😲