abnormally distended especially by fluids or gas
"hungry children with bloated stomachs"
"he had a grossly distended stomach"
"eyes with puffed (or puffy) lids"
"swollen hands"
"tumescent tissue"
"puffy tumid flesh"
Swollen or inflated in shape, as if filled with air; pillow-like.
"The boxer's face was puffy from the blow to his cheekbone."
In plain English: Puffy means swollen and puffed up, often because of fluid buildup or air trapped inside something soft.
"The puppy's face looked puffy after eating too many treats."
Usage: Use puffy to describe objects that appear swollen and soft due to trapped air or fluid, such as cheeks after crying or dough before baking. Avoid using it for things that are merely large but firm, where "bulky" would be more accurate.
Puffy is formed by adding the suffix "-y" to the word "puff." This construction simply means having a puffed quality or appearance.