Infantifa 

Younger adults and others who leash out in violent street mobs. Immature and unable to care for themselves, they often plea their cases publicly before both state and society.

Wow, look at that infantifa break that cars windows during this street revolt!

Infantifa by postfactor September 28, 2020

infinifat 

A portmanteau of "infinity" and "fat" originating from the BBW (Big Beautiful Woman) community in 2017, initially referring to wearing size XXXXXXL or larger. It slowly enlarged to encompass the HAES, Body Positivity, and Fat Acceptance movements. It has increased its scope beyond women's clothing and has since ballooned into a large-scale intersectional movement.

As the term has grown wider in usage its breadth encompasses those in the CDC's highest level of weight: Class III Severe (Morbid) Obesity. Although Class III starts at a 40 BMI, infinifat's are typically closer to a 47-50+ BMI. For a 5'5" woman this equates to a weight surpassing 300 lbs.

Infinifats view lesser BMIs as small-fats, mid-fats, or superfats (coinciding with Class I, II, and the lower-end of Class III Obesity) as having "thin privilege". Examples cited: being able to buy ready-to-wear (RTW) clothing from typical "Plus-Sized" shops (usually limited to XXXXL) and the ability to use typical body weight scales (that work to only 300 lbs).

Infinifat is debated as "gatekeeping" causing tensions within the increased scope of its expanded community and slow migration into intersectionality.

Many infinifats, e.g. Tess Holiday, claim recovery from an Eating Disorder (ED), Anorexia. Those within the opposing "Pro-Ana" (Anorexia) ED-supportive community say such claims coming from "Fat Acceptance" advocates are farcical and reflect a different ED: Binge-eating Disorder (BED) or more accurately, Tessorexia.

Bertha: I had to purchase two seats on the airplane because of my weight.
Tessa: Getting to purchase a single ticket on an airplane is an example of thin privilege that is denied to members of the infinifat community.
---
Olga: My doctor suggested I met the requirements for weight loss surgery due to my 40 BMI. I told her that I'm recovering from my anorexia and that suggestions of weight loss surgery are highly offensive and harmful to us infinifats.
Tessie: You're just "mid-fat", not "infinifat". You still have thin privilege like finding clothes in your size.

infinifat by SmurfberryDreams July 30, 2021

Infantilism 

Enjoyment from infant-related things. Pretending to be a baby, wearing diapers (see diaper lover, speaking like a child (ie "I sowwy"), sleeping in a crib. Wide range of things, but all infant-related

Note that this is interest in the trappings/behaviour of youth, not sexual interest in the youth themselves (that's a pedophile)

Infantilism by Anonymous March 20, 2003

Infantile 

To act in a childish or immature manner.

Alex: Today, in class, my friend and I kept laughing then annoyed the teacher. I must do it again soon!
Deeanna: Oh Alex, you're so infantile.
Alex: I know, I can't help it.

Infantile by Significant Auxiliary May 8, 2014

infantilize

verb trans.

to treat someone as a child or in a way that denies their maturity

jimmy infantilizes his friends all the time

infantilize by jeny September 11, 2007

infanta 

The daughter of a Spanish or Portugese King. Also, the first song off of Picaresque, by the Decemberists.

And we'll all come praise the Infanta.

infanta by Louder Than Bombs July 3, 2005

Infantile Pillock 

A child-like or child-sized penis.

Infantile: relating to infancy
Pillock: a fool or idiot; a penis

Person1: You're a jerk.
Person2: Butthead.
Person1: Infantile Pillock.
Person2: ... did you just call me a small dick? YOU'RE the infantile pillock.
Person1: Haha.
Person2: What's funny is that you aren't disagreeing...

Infantile Pillock by princess.peach December 30, 2009