STFU By EvilJanuary 29, 2015February 26, 2020Acronym STFU = Shut The Fuck Up = a rude way to say “be quiet” Fuck = Level 3 Curse Word (Most offensive level) Ex: I wish this lady sitting in front of me on the bus would “STFU.” She talks so loud. Ex: All the other students at my school like to spread gossip. I hate it, I wish they would just “STFU.” BACK to Acronyms