When I woke up today and my wife told me the Britain had voted to leave the EU, I was gobsmacked.
In other words, I was speechless, lost for words.
Gob is an informal word for mouth.
Someone who is opinionated can be described as gobby.
A crude way of telling someone to shut up is "Shut your gob!"
There was plenty of gobbiness during the BREXIT Remain/Leave campaigns.
I expected the result to be close but I never thought Britain would actually leave. I'm still gobsmacked. Probably, Prime Minister David Cameron is too - it's cost him his job.