I get to be useful!
Ceiling cat is a reference to possibly the earliest generation of memes. They mostly involved cats. Ceiling cat was a popular one of a cat poking its had down through a hole in a ceiling, captioned "ceiling cat is watching you masturbate" or something similar. The odd grammar/spelling is of the same Era, where these cat memes would be spoken in the "voice" of a cat. The most famous example is "I can haz cheezburger"
Leaving Britney alone is a reference to an early Era of YouTube video, where an actor bawling at the camera ranted about how people were being too mean to Britney Spears, a famous pop star. It was hotly debate whether the contents of the video were genuine or acting. Remember, this was before Snopes, even.
I think that was everything?
Aren't most states ethnically associated...? Like... the US and Canada are anomalous. European countries are particularly accepting of other ethnicities but still have a core ethnicity. Asian countries are usually pretty homogenous. I imagine African countries are, too. Latin America, I'm not as sure.
Or am I misunderstanding the definition of ethno-state?