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1.
spun-off from the popularization of the term catfish as seen in the documentary or on Mtv.

This directly relates to when a person intentional lies about their weight because they are far larger than they appear on their dating profile.
Bro: "Dude, that chick Beth I met of friendster, said she was 105 on her profile, when we met in person she actually weigh 105 more than me"

Dude: "Bro, you got fatfished"

Warning signs:
High angle close ups.
Animal profile pictures.
They list their body type as "a little extra"
by tubbytom February 06, 2013
 
2.
A fat-fish is a name appied to a person or animal, that is not necessarily overweight, who is being greedy, selfish, snobbish, or a hater.
Ben was certainly being a fat-fish on his birthday; he wouldn't share his birthday cake, and spent the afternoon talking smack about his brother.
by progre55ive December 03, 2009
 
3.
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 06, 2009
 
4.
Someone who carries influence. An important person, a big shot.
Translated from the Spanish term pez gordo.
He runs this school. He's a real fat fish on campus.

Él dirige esta escuela. Es un pez gordo real en el campus.
by Fondude May 30, 2011