What is cheesing meaning smile?

Cheesing refers to when someone smiles so largely that their cheeks become prominent, resembling the appearance of cheese. It is often associated with being happy, content or excited, and is a common expression of positivity and joy. The term "cheesing" can also refer to the act of taking a photograph with a giant smile, which may have originated from the tendency of American photographers to instruct "Say cheese!" in order to make their subjects smile.