verb (used with object)
to overcome with surprise and bewilderment; astound.

1765–75; variant of flabagast (perhaps flabb(y) + aghast)

flabbergaster, noun

amaze, astonish, stagger, nonplus, confound; perplex, confuse, mystify.
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World English Dictionary
flabbergast (ˈflæbəˌɡɑːst)
informal to overcome with astonishment; amaze utterly; astound
[C18: of uncertain origin]

flabbergasted (ˈflæbəˌɡɑːstɪd)
informal overcome with astonishment; amazed; astounded

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1772, mentioned (with bored) in a magazine article as a new vogue word, perhaps from some dialect (in 1823 flabbergast was noted as a Sussex word), likely an arbitrary formation from flabby or flapper and aghast.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He was absolutely flabbergasted to find out what those transcripts that he
  requested were costing people.
One of the high officials was flabbergasted to find the master unprepared.
Carpenter seems a bit flabbergasted when he considers what his little business
  proposition has wrought.
We were flabbergasted when the echocardiogram results came in that afternoon.
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