The 'Female-presenting Nipples' meme stems from a December 2018 policy update on Tumblr that banned adult content. The phrase was used in the official announcement to describe a specific category of banned imagery, which users immediately found absurdly specific yet confusingly vague. The internet quickly reacted with a deluge of satirical posts, questioning how an automated system could differentiate gender in such a manner. It became a hallmark of 'Tumblr culture,' symbolizing the platform's controversial shift in moderation and the hilariously clinical language often used by corporate entities to define human expression.