being totally speachless.unable to think of anything to say.
i was gobsmacked when i won the lotto
by mike briggs July 13, 2003
When your son tells you he volunteered to go back to Syria for 9 months-after spending over $4 grand at strip clubs in 2 days
I was gobsmacked by her stupidity
by Buttershots February 23, 2019
To be kissed without having a say in the matter.
Did you hear Peter gobsmacked me last night? The only was he was ever going to get his lips on me.
by nvidic June 25, 2009
Completely dumbfounded, shocked. From the Irish word "gob" meaning "mouth".

We were utterly gobsmacked when we spotted John at a restaurant on Friday night, after having attended his funeral that very morning!
by Terri M. December 7, 2005
UK Slang--def.

When someone is left speechless, dumbfounded, taciturn, non-plussed.
Regan: I think I'll be moving back to California.
Kennedy looked at her, gobsmacked.
Kennedy: Have you thought this through? You're my best friend, and yr leaving me?
by Babydoll75 March 22, 2019
Completely dumbfounded speechlessastounded. From the Irish/Scottish/Northern England word "gob" meaning "mouth".

I think it comes from the action of clapping your hand over your mouth when you are utterly surprised to the extent that you are unable to speak.
All the soccer fans were totally gobsmacked when Leicester City won the Championship.
by Tim Grim April 30, 2016
To be completely dumbfounded or shocked. That I know of, its origins are Irish.

I have know idea what a "gob" is or why it is common practice to smack somebody with one when they are shocked.

It seems like a rude thing to do, though.
"Well, I'll be gobsmacked!" exclaimed the taxi driver, as he watched two sworn enemies hug.
by Yogi!! April 18, 2005