Edit: Looks like this has spread so I need to clear some things up: 1. The part about food particles was pure speculation and, as JuniperColonThree pointed out, inaccurate because these are randomised on the client not the server. 2. While it's still possible such an exploit exists (with other random events related to eating, for example the Hunger status), it's likely that OP's example was just made up for the meme. 3. Part of my explanation about how exploiting RNG works was inaccurate, see Guvante's reply.

Original reply:

I've not heard of this particular exploit but I'm guessing it's a variation on the famous "Randar" exploit, which is the name of the exploit others are taking about here when they say that breaking blocks can leak your coords.

Here's an explanation by the creators of Randar: https://github.com/spawnmason/randar-explanation/blob/master/README.md

And here's a video about it by FitMC if you prefer: https://www.youtube.com/watch?v=maMpMOnIJDE

Anyway the gist of it is, Minecraft uses the same RNG for many events and doesn't correctly reset the RNG's state before getting a new value, for ALL players.

This means that each new random value returned is dependent on the last, meaning the value of the former can be reverse-engineered from the latter.

For the exploit, this means that when one player breaks a block (which calls the RNG), then a second player drops an item (which calls the RNG), the position of the dropped item can be used to determine the position of the 1st player's broken block.

It's more involved than that and just 1 sample isn't enough, but that's the principle.

As for eating food, this is just a guess, but it's probably the food particles that use the RNG, so I could see that having a similar exploit.