Plot twist: It actually says, "Eww, evil burgers", but you can't tell because they're as bad at spelling as they are at laying out letters in a legible order.
When I was a kid, the place setting for kids at some restaurants came with crayons and a placemat with lots of little puzzles and mazes and things for kids to work on while they waited for food. This reminds me of that. Especially where the secret message is "we love burgers".
I feel like maybe these were supposed to be stamps but someone just put them up on the wall instead? The words would still look dumb going from bottom to top bur at least they'd read left to right and the letters would be the right way.
Yes? You put ink on the raised letters and press them to a surface and they leave a reversed impression. If you did that with these signs, the letters would be the right way around and the words would read from left to right, top to bottom.
Edit: actually the letters are the right way around on closer look, so it would still be fucked up as a stamp so that theory is wrong. Idfk what's happening here.