What it means
To gobsmack someone is to leave them so shocked their mouth basically drops open and their brain clocks out for a sec. It’s very British, a bit punchy, and usually turns up as gobsmacked when someone’s been hit with wild news, a rude price, or behaviour that’s got some real nerve.
Usage examples
"The letting agent said the rent’s gone up again and it proper gobsmacked me, I just stared at him, mouth open, like an absolute muppet."
"The bill properly gobsmacked us, forty quid for two coffees and a slice of cake nobody finished."
"It gobsmacked the whole room when the quiet one stood up and announced he was moving to Japan."
"I was fully gobsmacked when she said he’d quit on the spot and just walked out with his lunch in his hand."
"Mum saw the takeaway total and got proper gobsmacked, kept staring at the screen like it had personally offended her."
Where it comes from
It’s solid British slang from gob, meaning mouth, plus smack, meaning a slap or hit. It starts showing up in late 20th century British English, especially as gobsmacked. The picture’s the whole point: surprise hits you so hard your mouth drops open and you’re left staring into the void for a beat.
Other ways to say it
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