A person or group of persons that spread Fear, Uncertainty, and Doubt with regards to electronics, software, or any other product or tool. Sometimes used as a marketing tool by competitors to denigrate a product, and sometimes used as a simple means of starting flame wars and attention-getting.
Me and my friends read somewhere that Pioneer Plasma TVs will make you go sterile, so you should buy Panasonic. Or;
Now that HD DVD is dead, Blu-ray is gonna screw everybody because they have a monopoly.
FUDdites sometimes merely make up rumors for the fun of it.