A quick google and itās not what I would assume. š
I guessed in @GassyHaggis context it meant something like fuddy-duddy maybe? A bit elderly. Clearly not!
Iāve also seen it used as the acronym meaning āFear, Uncertainty, Doubtā as in āthatās a load of FUDā in response to console warring posts.
Brave āThe High Lifeā