The phrase "a major slap" is correct and usable in written English.
It can be used to describe a significant or impactful criticism or reprimand, often in a metaphorical sense.
Example: "The review was a major slap to the film's reputation, leaving the director scrambling for a response."
Alternatives: "a significant blow" or "a harsh criticism".
The prospect of an end to free banking would be a major slap in the face for the majority of loyal customers, millions of whom have already paid to bailout the banking system with taxpayer-funded loans, guarantees and capital injections.
"That's not a major slap in the face to Hillary," said Joseph McCartin, a labor expert at Georgetown University.
It is more likely the result of self-fulfilling excess pessimism…What is needed is a major slap to the market's face.
"This is a major slap in the face to China, which had really stuck its neck out to make these talks happen," said Shi Yinhong, a leading expert on international relations at People's University in Beijing.
If we went beyond what we have done, it would be a major slap in the face to the attorney general and the governor, and we can't afford that".
North Korea's quick disavowal was "a major slap in the face to China," a leading political analyst here said, noting that Beijing would have been certain to make sure North Korea supported the text of the announcement before issuing it.
But PEI women who have had trouble accessing the procedure disagree on whether the announcement is "a major step" or "a slap in the face".
In boxing, such seemingly trivial disputes are considered major slaps in the face.
His message is clear ― either make the product in the U.S. or we'll slap a major tariff on the product if you try to import it back into the U.S. In other words, it may have sounded as if Mr. Trump was doing something substantive by intervening with Carrier [and Ford], but he wasn't.
Napster was the first company with a peer-to-peer sharing service to get slapped with a major lawsuit and to become a technomartyr.
The reaction of Walmart, a major customer for Alaskan fisheries, was like a slap in the face.
