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Don't touch my garbage!
(feddit.org)
Welcome to Programmer Humor!
This is a place where you can post jokes, memes, humor, etc. related to programming!
For sharing awful code theres also Programming Horror.
Not everything sent in PR is an improvement from everyone pov though. It might be an improvement for the contributor of a new feature they might be the only one to ever use, while it adds maintenance burden for you, more dependencies, risks of bugs etc for the community, which you have to balance somehow. Plus you might have a view on how to do things properly on your project, which needs to be communicated to contributors, which is additional work you might not have time for, especially if this is just some small side project.
This is not what the meme implies. This is rejecting all PR, regardless of quality or fit. That, I don't get.
It's an exaggeration for the purposes of humor. Its not that deep.