When you match with a girl on Tinder thinking she's fit but then you scroll through to her last picture, only to see she's slightly on the bigger side.

Jim: "Guys, I got a new match on Tinder"
Jim: *Scrolls through new matches Tinder profile*
Jim: "FUCK! I've been Fatfished
"I thought I matched with this proper fit bird on Tinder, but turns out I was fatfished."
by aintgot4eyesfornoreason October 10, 2018
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Noun, someone who deliberately portrays themselves online as slimmer than they are in real life.

Verb, being the victim or perpetrator of such misdirection.
"Hey Bez, how things?"

"Not so good buddy. I'm feeling a little blue as I keep getting fatfished on Tinder..."
by bonelessbucket March 25, 2021
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Similar to catfish. When a person who works at a place that wears a uniform goes into the back of the establishment and you expect them to come right back out. Instead a fat person in the same uniform emerges.
I expected Steph to come right back out from the kitchen shaking that sexy ass. Instead…I got Fatfished by Large Marge who lumbered out in the same uniform and made me question my attraction to women at all.
by Notmynamehere July 22, 2023
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A fatfish is a name applied to a person or animal, that is not necessarily overweight, who is being greedy, selfish, snobbish, or a hater.
Ben was certainly being a fatfish on his birthday; he wouldn't share his birthday cake, and spent the afternoon talking smack about his brother.
by progre55ive December 7, 2009
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