Okay, I might not have gotten the lingo yet: I see so many posts about “Rule” and I don’t get it. Can someone ELI5?

The old subreddit had one rule, you had to make a post before leaving. People started just saying “rule” in the title as a joke about begrudgingly complying with the rule.

Duuuuuude thank you. I was kinda close going on context but it makes sense now!