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Someone who pretends to be someone else, especially on the internet. Found on anywhere from instagram to twitter to chat sites, these people use fake pictures to disguise who they are. A synonym for this in some situations may be "troll" because the majority of catfish out there are simply out to troll others, while others have their own reasons for this approach. Often catfish, once discovered, are faced with people full of annoyance and frustration at being "catfishes"
Matt: Ah man that chick Kasey I liked was a catfish all along. Even the booty was fake!
Mark: Ah duuuuuddeee that sucks lets go get you a real girl with a real booty.
by callmeardilla September 06, 2015
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A catfish is someone who pretends to be someone they're not using Facebook or other social media to create false identities, particularly to pursue deceptive online romances.
Did you hear how Dave got totally catfished last month?! The fox he thought he was talking to turned out to be a pervy guy from San Diego!

or

I was really falling for that gorgeous gal on Facebook, but she turned out to be a catfish.
by sbacker July 22, 2010
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A catfish is someone who assumes a false identity on the Internet using various platforms including but not limited to Facebook, Twitter, and Instagram. A catfish is often undesirable in comparison to thier profile, as an actual catfish would be to a premium "catch" fish like Alaskan salmon.
I met this guy on match.com who was a total catfish. His pic was cute but he obviously thinks he is a time traveler cause he looked like Matlock!
by Jwoflava August 11, 2013
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To give the impression of being an attractive person in order to attract someone online while being a complete or near opposite of that portrayed.
I met this girl online that looks like Kate Upton, but it turns out I was being catfished because then we met and he looked more like Michael Moore.
by Leroy Jenkings April 02, 2015
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Someone who pretends to be someone they're not online to create false identities, particularly to pursue deceptive online romances.
Freshman year I started chatting with this chill girl online, only for her to turn out ugly-ass catfish. Never again.
by Midoof September 28, 2010
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6
someone who pretends to be someone they are not online to create false identities, particularly to pursue deceptive online romances.

From the 2010 movie Catfish
Many guys have multiple accounts on facebook because they are catfishes
by Dexxe September 02, 2010
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A catfish is someone who pretends to be someone they're not on the internet.
Did you hear how Bonnie Combs got totally catfished last month?! She was caught lying about her life on the internet!
by pixiemaguire September 16, 2014
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