The acronym for a person who is Full of Shit. When someone is constantly telling outrageous lies, typically about themself, in order to impress others.
"Did you hear that FOS was offered a full scholarship to Harvard, but turned it down to be a UPS driver?"
by Quinn Littles May 14, 2009
 Get the FOSmug.
Get the FOSmug. Abbreviation and slang for North Fort Myers, the white trash part of the Fort Myers/Cape Coral, FL area. Home of Suncoast Village aka Scumcoast Village, the largest trailer park in the nation.
Person A: "Where do we got to go to pick up these bitches?"
Person B: "No Fo baby!"
Person A: "No Fo?! Man, you got us on the way to pick up some trailer trash crackheads!"
Person B: "No Fo baby!"
Person A: "No Fo?! Man, you got us on the way to pick up some trailer trash crackheads!"
by John Boy28 January 14, 2009
 Get the No Fomug.
Get the No Fomug. by Ty Chapman May 4, 2005
 Get the fo'mug.
Get the fo'mug. An abbreviation, meaning "fuckable-on-site". Used to classify extremely sexy people who arouse others to an immediate, uncontrollable frenzy.
by _Jules_ December 21, 2008
 Get the FOSmug.
Get the FOSmug. 

