Hi!  I heard a new word that I just love…it is fun to say too…gobsmacked.  So I dug around and found the following on yahoo:

(adj) gobsmacked= (utterly astounded)

U.K. extremely shocked: extremely surprised or shocked ( slang )

To be gobsmacked – it means to be astounded, flabbergasted, speechless with amazement. And what you’ve got is the perfectly ordinary word ’smacked’ (to smack) and a Northern word ‘gob’. Gob is the Northern word for mouth. I used to live in Liverpool for many years and you’d say to people “ah, shut yer gob”, you know, and it simply means, mouth. So, to be ‘gobsmacked’ is to be struck dumb as if by a smack in the face.