When I was a kid, I used to read Webster's Nth Collegiate dictionary in the bathroom. Really. Today's word, I think is as follows.

Gobsmacked

As if smacked (“hit”) in the gob (“mouth (Irish / Scottish gaelic)”).

Attested since 1980s, from Northern English dialect, particularly Liverpool, popularized via television.

gobsmacked (comparative more gobsmacked, superlative most gobsmacked)

(chiefly UK, slang) Flabbergasted, astounded, speechless, overawed.
- 1989, Glenn Frankel, "Salman Rushdie's Life on the Run," Los Angeles Times, 7 Aug.,
  We were as appalled and stunned and confused and gobsmacked (punched on the mouth) as anyone else.
- 2008, Caroline Mallan, "Linwood Barclay novel wins a plug on key UK book list," Toronto Star, 16 Jun., p. A2,
  "I guess the word would be gobsmacked," Barclay said, of his reaction. "I am stunned."

Man, life and the curveballs...