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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."
fatkini by VictoriousSecret June 13, 2013
Related Words
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."
Fatkini by Gabbi Grabby April 20, 2015
a girl with big hearts. and a lovely girl with sweet face. she's feeling happy everyday even she had a problem and always cute.
Fatini , u're so cute
Fatini by alisyaaaaa December 27, 2016
A girl who is always happy around people, never shows if she's sad, mad or upset because she doesn't want to hurt anybody. Kind, Cute, Generous and LOVES Animals and Kids. A great friend and listener. But there is a sad back story to her life.
"Fatini you are an amazing girl."
Fatini by 김하늘 December 31, 2016

Fatminist 

Feminist that glorifies and encourages obesity
Advocating diet is an insult to fatminist
Fatminist by Pseudoquasisudo August 29, 2016

fatkins diet

Another name for the Atkins diet, since it endorses foods low in carbs, but often very high in fat, thus making the dieter fat anyway.
Tammy: "Shit. Look at me. Why am I so fat?"
Sammy: "Probably has something to do with that HUGE FUCKING TUB OF CRISCO you just ate. That was 100% bona fide LARD, bitch!"
Tammy: "No, that wasn't it, that was Atkins-approved so it has to be good for you. Oh...you know what it must have been...that one slice of Wonder bread I ate yesterday. Yeah, that must have had 7 or 8 grams of carbs. I never should have eaten it!"
Sammy: "Bitch I suggest you lay off the Fatkins diet and GET OFF THE FUCKING COUCH FOR ONCE!!!"
Tammy: "Are you kidding? Then I'd miss the 'Days of our Lives' re-run that's coming up. Hey, could you go to Wendy's and pick me up a triple bacon cheeseburger? No bread of course. I'm hungry."
fatkins diet by Nick D July 20, 2004