A Fudder is a person who deliberately spreads bad news, fear, uncertainty, and doubt about a particular cryptocurrency project.

Fudder is a term used in the crypto community to characterize people who actively spread negative information and FUD (fear, uncertainty, doubt) towards a crypto project. The main goal of a Fudder is to influence the market sentiment and price of the crypto they are targeting.

By spreading bad news, rumors, or exaggerated criticism that is often unfounded, fudders attempt to create fear, doubt, and uncertainty among crypto investors and traders. As a result, the price of the fudder's crypto will drop. After the price drops, the fudder will then buy the crypto in large quantities to resell it when the price improves.

Fudders usually target new crypto projects that are on the rise. They are active on social media and crypto forums spreading FUD, mostly under anonymous identities. Investors are advised to be cautious and do their own research before blindly believing negative information spread by fudders.