Llamer or illmer
Just like the "lamer" term from the 80s and 90s:
https://en.wikipedia.org/wiki/Lamer
It basically boils down to: Someone who has no idea what they're doing. Someone who is willfully ignorant of how things work or are meant to be used.

But think of all those children who lost their lives because they saw people having sex on the Internet!
The ones that survived are scared for life! Missing limbs, eyes blinded, forever unable to work. They'll be begging on the streets!
Right?