An I-kid (I for internet) is a person born into internet prominence and exposed to the internet at a young age (often Generation Z), making them desensitised to the internet, perceiving extreme things as normal. People such as lolicons, furries, VTuber fans, ERPers, femboys and Coomers fit into this category.
John: Hey Jerry, what is femboy Garfield?
Jerry: Just something those I-kids thought up. Best not to google it, you know, with blissful ignorance and all that.