New Meme??

I know this is a chess club, not for random memes, but can anyone explain what "53" means? My friends keep randomly walking up to me, staring right into my eyes and saying "fifty-three" in a monotone voice. I asked them what it is, but they just said that it's a new meme that no one knows the origin of.

If anyone knows what that is, please tell me.

STOPPPP NOOOO A BRAINROT AHHHHHH BURNNNN ITTTT IT'S NOT FUNNY ANYMOREEEEEEE FFFFFFFFF BURNNNNNM 💥🔥💥💥💥💥💥💥🔥💥💥💥💥💥

I know it's probably brainrot, but still, I wanna keep up with the memes. Plus it's not really brainrot if only a few people know it

五三... okay not Chinese reference brainrot

lol

go and search 53 on youtube 💀

I just get 53rd episodes of random series/movies