From Longman Dictionary of Contemporary Englishcatfishcat‧fish /ˈkætˌfɪʃ/ noun (plural catfish) 1 [countable, uncountable] a type of fish that has whiskers (=strong hairs) around its mouth and lives in rivers or lakes2 [countable] informal someone who lies about themselves on the Internet in order to impress people, especially so that someone will start a relationship with them
Examples from the Corpus
catfish• You meet a man who has a catfish named after him.• Ideal for cichlids and catfish tanks.• I would like to add another catfish.• I have yet to try the whole charbroiled catfish.• Check on salt tolerance of your fish especially some of the more delicate catfish before treating.• I lifted out what appeared to be a very large catfish.• A while back, I wrote about my experience of keeping some of the newer catfish on the market. 