Public Server

Outside of a computer. Anywhere that isn't online or where there is digital contact being made. eg:. Discord or a video game chat would not be considered a public server.

New name for "meatspace".

Dave: Remember what we talked about last night?
Mike: Don't remind me. We're literally in a public server. Keep it for the chat logs.

Public Server

It basically means when you're either out in public/outside.

Person 1: EVERYONE, I HAVE AN ANNOUNCMENT TO MAKE!
Person 2: In a public server is insane!