Damned Scots, They Ruined Scotland is an exploitable template taken from The Simpsons in which Groundskeeper Willie is talking about people with whom the Scottish took issue with, including Scottish. After Principal Skinner points out the Scottish are contentious, Willie says “You’ve just made an enemy for life!” The template has been altered to comment upon toxic or combative communities online, fandoms or organizations.
The quote comes from episode 12, season 15 of The Simpsons, broadcast on February 15th, 2004. Groundskeeper Willie, voiced by Dan Castellaneta, is commenting on Bart and Lisa’s rivalry and comparing it to the Scots and their rivalries.
The first screenshot of the scene was uploaded to Imgur on May 30th, 2013, gaining over 10,605 views since then.
The first use of the phrase as a meme was posted to r/anarcho_capitalism on January 30th, 2014. It has gotten 37 points since then.