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A bikini that is for plus-sized women.
"That girl with the nice body has a nice fatkini!"

"Hey, do you sell fatkinis?"
"Do you sell fatkinis? Bikinis for plus-szied women?"
"This is Abercrombie & Fitch, girl, of course we don't."
by Chris's_Zen May 24, 2013
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Jul 6 Word of the Day
Phrase meaning that a deceased cannot rest in peace until society changes due to the circumstances of a death.
People said rest in power for the unarmed man had been shot by the police.
by FooBarBiz October 12, 2017
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A bikini that is designed to be worn by plus size women. It is cut differently than more traditional bikinis so as to make the wearer feel less self conscious about being fat.
"I'm 5'4'' and I weight 250 lbs. I don't think I could ever wear a bikini. I'll just have to stick to a one piece"
"That's not true, try a fatkini."
by VictoriousSecret May 24, 2013
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1. A swimsuit worn by insecure fat women who would rather be seen wearing diaper-shaped bottoms than let people see their enormous FUPA. It's purpose is to make overweight girls feign confidence and think they're tricking people into thinking they're not fat.
1. "Why is that girl wearing a diaper to the beach?"

"It's not a diaper, it's a fatkini."
by Rhet Ograbme April 20, 2015
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