"What a boy!", for example, could be used as an exclamation of either a (male) achievement OR as an exclamation of immaturity. Both tone and context would determine. Your sentence is an exclamatory sentence which is used more frequently in spoken language.
Exclamations with "what a (n) - English Language & Usage Stack Exchange
Explanation of the English phrase "what a (something)": What a ___" communicates the idea "That's really ___" or "You're really ___." Here are some examples: If you have to throw away food that's still good, you can say: What a waste, huh? Here's something a woman can say when a man opens a door for her: What a gentleman! Thank you very much.
When someone says What A, they're pointing out that the thing being discussed is either too much, too little, or just plain different. It's the street equivalent of calling something out, and it's often used with a mix of judgment and flair.
The correct phrase is "what a". "What a" is a common English expression used to express surprise, admiration, or other emotions. On the other hand, "whatte" is not a standard English word or phrase. This is not a correct or commonly used English phrase. This phrase is not used in English.
Learn the definition of 'what a ...'. Check out the pronunciation, synonyms and grammar. Browse the use examples 'what a ...' in the great English corpus.
(used in questions as a request for information): What is your phone number? What is your wife's name? What is the matter? (used in questions to ask about the character, origin, identity, or worth of a person or thing): What is the meaning of life? What is wealth without friends?