What is gobsmack?

Gobsmack is a term that originated in the United Kingdom and is commonly used in British English. It is an informal expression that means to be extremely surprised or shocked, often to the point of being speechless or unable to react.

The term "gob" in this context refers to the mouth, and "smack" refers to the sound of someone's mouth hitting the ground in surprise or shock. The word has since spread to other parts of the world and is now used colloquially in various English-speaking countries.

It is also the name of an American rock band formed in 1995, known for hits like "I Stand Alone," "When Legends Rise," and "Bulletproof."