What is cheesin hard?

"Cheesin' hard" is a slang expression primarily used in informal contexts to describe someone who is smiling widely or grinning from ear to ear. The phrase often conveys a sense of genuine happiness, amusement, or satisfaction. It's a playful and lighthearted way to depict someone who appears to be in a very good mood, usually due to a joke, pleasant news, or a positive experience. This expression is part of a broader vernacular where "cheese" or "cheesy" is associated with expressions of happiness and joy.