The DU Lounge

It's from a scene from Monty Python's The Life Of Brian, and it's depicting an internecine squabble about which, of many groups (in this context, Jewish people against their Roman rulers) is the real/pre-eminent group of 'revolutionaries', and the joke is that nobody really knows who's part of which group, they change their names frequently, fight amongst each other so nothing productive actually gets done. You kinda have to have seen the movie for it to have meaning, and would only have value as a meme in a very specific context/discussion.