FUD is an acronym for "Fear, Uncertainty, Doubt" and is commonly used in the cryptocurrency community as a short way to describe negative information about a blockchain based currency or asset.
by goodcore May 15, 2016
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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!"
by Mr Bawbag July 10, 2012
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Scottish slang term meaning pussy, vagina, muff, cunt
"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"
by big gee from glasgow April 29, 2005
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