The term "fatting" can be defined as the process of making something or someone fatter. However, there are numerous synonyms that can be used in place of "fatting" depending on the context. These include "fattening," which is the most commonly used synonym. Other synonyms include "plumping," "enlarging," "expanding," "bulking up," "augmenting," "thickening," "hefting," "beefing up," and "chubbifying." Each of these terms can be used to convey the same meaning as "fatting." It is important to choose the right synonym based on the intended context and tone of the writing or conversation.