It’s a reference to the game Baba is You, which allows you to manipulate the rules of the game by moving blocks around to form sentences like “Wall is win” or “Tree is you.” In the picture, someone tries to make a move switching “Baba is You” to “Baba is Win.” This makes touching Baba (the usual player character) the win condition, but it also means you’re no longer controlling Baba so there’s no way to actually move your character to the win condition. I hope that makes sense, if it doesn’t you can look up some gameplay on YT or something. It’s kinda tricky to explain in words.