It's a popular meme so you don't have to have played the game or even really be much of a gamer. You'd have come across it at some point hanging out on social media.
1. how many people don’t “hang out” in social media culture, and only circulate on there with family and peers using everyday idioms and emoji/abbreviation; if they use social media at all,
2. how many different, disjoint online cultures there are. Many things widely circulated on reddit and adjacent communities may never surface on some FB mom’s group
People maintain much more different lives from each other than you seem to assume, even among those that who are “terminally online” or that “hang out on social media”
I was just pointing out that knowledge of the meme wasn't as obscure as having actually played the game, which would be a much more limited audience than even just reddit users.