outlet prowler
In an airport, someone who wanders far from their gate in search of a working electrical outlet into which they can plug their laptop power cord, or occasionally other electronic devices. Can often appear strange or creepy while looking for outlets, craning the head and looking near people.
Person one: "eww that creepy guy with a briefcase is back again... he keeps crouching and looking under my legs!"

Person two: "don't worry, there's a laptop in there, he's just an outlet prowler."