Thread:BunsenH/@comment-25404524-20160713233427/@comment-24577221-20160719001154

Super29392 wrote: What's a sockpuppet? Literally, it's a puppet made out of a sock. An old sock is a simple starting point for making a puppet. It's a nice craft project for young people. All you need to make a puppet is a sock, some paper or fabric scraps, and some glue -- or even just a sock and a marking pen.

On the internet, it's as Qwerty says. Imagine someone who has gotten into trouble holding up a sock puppet and trying to pretend that the troublemaker was really the puppet, or that the puppet is a new person and not the one who got into trouble.