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Deceiving someone via social media or dating site by posting/sending pics or videos that are very old and
don't represent the way you currently look.

Koi's are the longest living fish. They have been reported to achieve ages of 100–200 years. - Wikipedia
Fuck man I got koifished on POF. That chick I met the other night looked hot on her profile pics, but when I saw her she looked 15 years older and had gained alot of weight.
Koifished by foxaguilar August 21, 2018
Katfish is the most amorevolous and mirific cavernicolous fish in the modern state of Lemgo. Its tail is golden and its words are poetry. Some say, the Katfish is a frankenfish, but according to Henning van Jodes this really is just fake news made up by biologists who would've vended their very first-born to have made the groundbreaking discovery of the Katfish. It has been scientifically proven, that the first contact with the Katfish was absolved by Apache. Various experts suggest the assumption that Apache still approaches Katfish, but keeps it a secret for the prevention of media scrum.

Scholars generally agree that the Katfish was raised in the Republic of Oberbieber and spoke a dialect of Cute as its first language. The Katfish went to sea at a young age and travelled widely, as far as seaweed grows and quotes it is best known for worldwide are the scientific terms of "perf" (not to be mistaken with perv) and "def".

Therefore a person named Katfish is the embodiement of grace and seaweed. When calling a person Katfish, this means the deepest love, devotion and a "huge craving for crisps"(1).

(1) Quote by Enis (MySpäti Berlin)
Your tail is breathtakingly golden/your words sound like deep poetry to me, are you a Katfish?

Do you wanna be my Katfish?
Katfish by Fürst December 17, 2020

Fatfished 

When a “bigger” gal only takes pictures from the neck or chest up to appear skinny but in person she’s totally a bigger gal.
Danny: what’s up with you and that girl you met on tinder bro?
Nick: Oh her? Nah man she fatfished me. Totally got me dude. Nothing like her picture.
Danny: Damn bro that’s crazy! Shit...
Fatfished by iamanthonydean December 23, 2018

katrashed 

1: devastated, in ruins, wrecked, demolished
2: completely under the influence of drugs or alcohol, wasted, drunk
After hurricane Katrina katrashed New Orleans, his house was gone forever.

When he returned home from the bar, his new roommate realized he was katrashed when he could barely walk up the stairs.
katrashed by VinnyBinx January 14, 2008

catfished by the cloud bots 

Several cloud bots, often from through the interaction of several different Tech subcontracting organizations or search engine optimization, gives an illusion of an active meet-up group in a locale.
"I went to the meetups, yet I was catfished by the cloud bots."
Hatfishing is a practice where a man purposely deceives a potential romantic partner by wearing a hat on every date to hide his rapidly receding hairline.
"She went on dozens of dates with Tom before it occurred to her that she had never seen him without his Ducati hat on. Her friends were right - she was being hatfished."
Hatfished by Tzensant June 12, 2020