Used mainly in computer-based conversation (instant messaging, email, text messaging, etc.) I told that jerk to STFU yesterday. Stfu. See more words with the same meaning: Internet, texting, SMS, email, chat acronyms (list of). See more words with the same meaning: censored replacements for offensive terms (list of). See more words with the same meaning: retorts and taunts (list of). Last edited on Apr 07 2013. Submitted by Anonymous on Dec 11 2001. +