The Brief: STFU stands for "Shut the f**k up."
Synonyms: Shut up, Stop Talking
Used primarily in texting or internet messaging, STFU stands for “Shut the f**k up.” Its message can be somewhat confusing via text, because it can be said in both an aggressive or sarcastic tone.
Not to be confused with STFO, meaning “Stay the F**k out.”
If u dont have anything nice to say u might just stfu… pic.twitter.com/5CuchBnv0m
— 𝖘𝖎𝖙𝖎 𝖐𝖍𝖆𝖉𝖎𝖏𝖆𝖍 𝖍𝖆𝖑𝖎𝖒 (@seteyy_) January 28, 2019