puriteen 

A (almost always) young person on the internet who thinks that the internet has to conform to being entirely sfw, and puts all of their time and energy into attempting to police art and media for any remote depiction of sexuality they personally disagree with. They are often seen screaming in comments sections and making personal attacks against nsfw artists over a drawing, when their anger would be better directed towards real people who genuinely advocate for harmful behavior.
Keep in mind, immature adults can also have the mentality of a child and fit this definition.

Puriteen: "OMG THIS DRAWING IS SO PROBLEMATIC DELETE YOUR ACCOUNT RIGHT NOW. EVERYONE ATTACK THIS PERSON!"
Rational adult: "My account says it's 18+. You're not even supposed to be here, you weird puriteen."

puriteen by gulk October 28, 2023

puriteen 

An online child who is deeply uncomfortable with the sense that people online might present sexual characteristics and who proactively demands that people curtail behavior that they interpret as sexually suggestive.

Seriously the only people arguing to ban kink at pride are 4chan nazis, cynical twitch streamers and puriteens.

puriteen by blockchildrenontwitter May 26, 2021

Puriteen 

A dogwhistsle for online pedos who put their kinks into sfw spaces full of kids

"these puriteens won't let me put my obviousky nsfw vore kink into spatoon, i am being scilenced"

Puriteen by Gummy34 September 21, 2022