Back on Reddit some dude and his roomates made a subreddit called r/195 (their dorm number). It only had one rule, when you visit, you have to post a meme. Eventually the public found the subreddit and started posting their own memes. It got huge and out of hand and some awful stuff started getting posted so they finally deleted the subreddit. That disappointed a bunch of people so a sequel was made, r/196. This community is a recreation of that second subreddit.
Being defederated just means you can’t see new posts on beehaw communities and they can’t see your communities at all. If your instance and beehaw are both federated with a third instance, like the one this community is on, then you’ll still be able to see comments by beehaw users on that instance.