Stands for "Fuck you, fatty!" based on an Internet discussion wherein a self-righteous workoutaholic pseudonutritionist was passive-aggressively tisk-tisking about a perfectly healthy-sized (i.e., not anorexic) woman eating a cookie. Commenters who saw right through the kidding/not kidding dubbed her attitude "FUF". The rest is history.
by GrammarHammer June 28, 2018

FUF stands for Follow Un-Follow. A social media strategy based on following large amounts of people, waiting for a follow-back and then unfollowing them.
by The Masculine Handler March 18, 2022

by Lobstrocity July 22, 2022
