It’s funny when we talk about how so much of our current humour relies in oblique references to other stuff, and sometimes people are like ‘Other generations would be completely confused!’ This always makes me think that they haven’t read Dorothy Sayers OR PG Wodehouse, because both Lord Peter Wimsey and Bertie Wooster pepper their speech and jokes with quotes and fragments of poetry and literature, and if that isn’t an offline equivalent I don’t know what is.
In conclusion, am I saying that the early 20th C upper-class English tendency to liberal use of classical quotes is a type of meme? Yes.
Am I also saying that both Bertie Wooster and especially Lord Peter Wimsey would be absolute memelords if they were millennials? Also yes.
I would also point out the longstanding existence of the in-joke.