BFU stands for "Bezny Franta uzivatel," which is Czech for "common Frank user." People primarily use it in central Europe to describe inexperienced computer users but may also use it in general when people make blunders.
You will most likely see the acronym online when people criticize other users for doing something stupid. Some classic BFU blunders include taking a screenshot of your desktop with your phone's camera or trying to turn your computer on when its power cord is not even plugged into the outlet.
Example
I thought I knew something about computers, but I feel like such a BFU around all these computer nerds
BFU stands for "Bezny Franta uzivatel," which is Czech for "common Frank user." People primarily use it in central Europe to describe inexperienced computer users but may also use it in general when people make blunders.
You will most likely see the acronym online when people criticize other users for doing something stupid. Some classic BFU blunders include taking a screenshot of your desktop with your phone's camera or trying to turn your computer on when its power cord is not even plugged into the outlet.