FEFF means good 'ol boobies. Whether you're a man or a woman, or something else entirely, we can all agree that boobs are something else. While no one knows where FEFF originates, nor what it stands for, it can be used as a fun starting conversation (jk, plz respect people. no catcalling plz).
Commonly confused with the verb feff, which is drastically different.
Look, bro, that girl's FEFFs are bigger than mine! Her elbows are an eye-catcher, tho