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The motivational encouragement of fat people to become thin again.
friend: Do you support fatism?
me: Yes I do. I am talking to 3 fatsos, trying to make them realize how ugly and stupid they are.
Fatism by 2HITLER4ME July 26, 2014
Related Words
Embracing the lifestyle of a fat people
Even though she was skinny at the time, I could tell she was starting to embrace fattism as she plunged her face into her second scoop of ice cream
fattism by angstd April 17, 2009
Fatism defines the prejudice to fat people (aka being rude to fat people)
Ryan: Fat people are fat!
Omar: Hey, ryan! Don't say that! That's fatism! :O
Fatism by OmzWG June 7, 2014
A term used by fat people (and their friends) to describe the discrimination against fat people based on their weight.

In reality, the term "fattism" was coined by fat academics to legitimise widespread obesity in the eyes of the medical and wider communities. In other words, fattism is a fat people's conspiracy to make everyone think that it's okay to be fat.
Fat person: I'm a victim of fattism - I can't get a job.
Thin person: Shutup tard, fattism's just a conspiracy formulated by people like you to make people think it's okay to be fat.
Fattism by IWANTTOBELIEVE September 16, 2012
Prejudice against overweight persons. Also weightism. Very common in Europe, less so in America where most of the population is out of shape.
Fatism permeates the fasion industry.
Prejudice and discrimination against people who are considered overweight according to current societal standards. Fatism, or weightism, is frequently excused, tacitly approved, and perpetuated on the basis that it is linked to the legitimate health concern of obesity. However, the function of fatism is not health-related. Instead, it is a means to oppress and marginalize an individual based on a perceived inadequacy in their appearance. Fatism can even be a subconscious, internalized bias.

Fatism is also often viewed as a feminist issue, because this form of discrimination is generally applied more heavily against women than men in most modern cultures.
When Bill decided to promote Gwen instead of Margaret because he felt Margaret’s extra weight was repulsive and didn’t represent the company's values, it was a clear case of fatism.
Fatism by Lelliefant February 7, 2019