[!!!1elf] is a meme deliberately using a unmeant product of great excitement. Whether it’s anger or joy, when someone „on the internet“ gets really excited, they tend to use a very fair amount of exclamation marks. People then often happen to let go of pressing shift while typing, resulting in writing „1“ instead of „!“. As a meme, this practice has evolved to where people now put the written word „one“ or „eleven“ among exclamation marks.