An acronym commonly used in instant messaging or online games (mmo)for Shut the Fuck Up. Used to save time when typing and by n00bs...
by your mom's face... June 11, 2006

STFU means "Shut The fuck up!!!!!" normally said to people who are very annoying or just won't shut up.. Used also a lot to people who don't know what it means
by The leet gangster November 15, 2007

St. Francis University
by Schultz February 3, 2005

by donkeypoodle December 20, 2007

the definition of stfu is Save The Flying Unicorns, used to make someone shut the fuck up by using confusion.
by xXx_anonymous69_xXx August 15, 2016

1) The messaging acronym for "Shut the fuck up."
2) The initials of the fictional organization "Scarf Team Freaks United"
2) The initials of the fictional organization "Scarf Team Freaks United"
by Zizefia September 6, 2007
