User blog comment:TheUnrealPanda/I have a question/@comment-5643552-20150227175640

It's derived from the term "copypasta", which is net slang for pieces of text that are copied and pasted throughout the internet (usually on forums or imageboards). In its early days, creepypasta was basically the internet equivalent of telling spooky stories around the campfire, so 99% of the stories were reposts. Nowadays it's more like traditional horror literature perpetuated in an online medium, with a lot more focus on originality and quality of writing and almost no focus on author anonymity.