The phrase "a big smack" is correct and usable in written English.
It can be used to describe a loud kiss or a strong hit, often in a playful or informal context.
Example: "She greeted him with a big smack on the cheek, making everyone laugh."
Alternatives: "a loud kiss" or "a strong hit."
Exact(4)
There's a big smack of reality".
In the weeks after the App Store submission process went live, a number of developers got a big smack in the face from Cupertino.
He deserves a big smack.
The upshot to John Doe is a new CURRENT hit on his credit report and thus a big SMACK on his credit score.
Similar(52)
She plants a big fat smack on the entire region.
Every time a user places another bid, additional time is added to a big clock smack in the middle of the screen — it's not entirely unlike QuiBid's system, except (y'know) much less shady.
But in the time it took for one concussion (Kolb) and one big smack to the ribs (Vick), things changed.
FASB did away with what was called pooling of interest accounting, which Briloff says Cisco used to avoid the big smack to earnings.
30th over: England 156-2 (Shah 51, Collingwood 49) van der Merwe drops short and Collingwood pulls him zestily for a big six, smacking a lady on the head in the process.
Amazing, edgy plays like Avenue Q, Urinetown and the ubiquitous Rent have left the Great White Way, and the void is aching to be filled by the next big smack-in-your-face thing.
-- Herman Melville, 1863 When a credibly hot-under-the-collar Piers Morgan told Larry Pratt, executive director of Gun Owners of America, on his CNN show, "You're an unbelievably stupid man, aren't you?", my first impulse was to gloat that, at last, the gun-lobby had gotten the big smack-down that it and its millions of credulous adherents deserve.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com