But to understand it, you'll need some backstory! Here in Sweden, we have something called Glocalnet, or used to have... I'm not too sure on that. Anyway, Glocalnet was a type of IT- and telecommunication-company. And there was this joke called, "That's even lower than Glocalnet." the joke being that Glocalnet was low for some reason and if something is lower than it... Well then that thing is really horrible.
So now onto the joke:
"You can't win against Glocalnet in limbo. Unless you're Diglett."