Definitions

1. adverb

in a fat manner; having a lot of body or substance

“The cake was eaten fatly at the party.”

2. adverb

in a manner that is characteristic of fat people; with a tendency to overindulge

“She ate fatly over the holidays and gained several pounds.”

3. adverb

with a great deal of energy or enthusiasm

“They worked fatly to meet the project deadline.”