Someone who is a subscriber to Alex Day, also known as Nerimon on the website YouTube. This is a short version of Nerimon's Subscriber Army. Typically is a YouTuber who has been on the website for two or more years. An official member of the army would have claimed a number on the list which would have theoretically been printed onto a shirt, pin-badge or sticker.
(the website and list have been forever lost into the depths of the interwebs as no one has paid for or visited the domain in a year)
"Have you heard of this guy Nerimon on YouTube?"
"Of course! I'm totally a Nermie"