It's a GitHub repository with a name consisting of 132 'e's, the maximum limit on GitHub [0][1].
People started contributing more and more esoteric code to print 'e' repeatedly in their favourite programming language. Eventually the repository was disabled, and the author got into a long-winded discussion with GitHub. Eventually the repository was archived [2].
https://gist.github.com/isaac-rstor/8bab8a47f6848613d7a23092...