"Rule 34" is an internet meme that means if there's something out there, someone has probably made a naughty, weird, or funny version of it on the internet. For example, if you like unicorns, and you search for unicorn pictures on the internet, you're likely to find pictures of unicorns doing something weird or inappropriate, like wearing human clothes or riding on a rocket. It’s just a silly reminder that the internet can be a weird and unpredictable place, and there’s no telling what you might find!