Although "fud" is widely accepted in Scotland as being a slang term for the female reproductive organs, it is generally used as a pejorative to describe someone who has just done something stupid, often in situations where they've either been impulsive or it was blindingly obvious beforehand that it was a stupid thing to do. It can also be used to describe someone who irritates everyone because they try to impress everyone all the time & invariably talk a load of pish.
"Haw ya big fud!" (angry)
Person A "Ah canny be fucked wi him!"
Person B "How?"
Person A "Coz he's a pure fud!"
Person A "Ah canny be fucked wi him!"
Person B "How?"
Person A "Coz he's a pure fud!"
by Mr Bawbag July 12, 2012
Get the Fudmug. by you October 28, 2001
Get the FUDmug. "Your a fud"
"I rolled over in bed and accidently kneed her in the fud. She woke with a scream and punched me in the balls"
"I rolled over in bed and accidently kneed her in the fud. She woke with a scream and punched me in the balls"
by big gee from glasgow April 29, 2005
Get the FUDmug. by CiaranP May 13, 2006
Get the Fudmug. by peegee January 2, 2009
Get the fudsmug. 
The Epicurean way offers such refreshment in the face of extremism, division, and as my father would put it: "fud” (fear, uncertainty and doubt).
by The Autarkist December 20, 2014
Get the FUDmug.