PewDiePie subscriber.

A portmanteau of carpe diem, a Latin phrase that means “Seize the Day!” and DM, which stands for Direct Messages. This word means seizing the day via DMs.

It is what soldiers of the Pewdiepie army are called. They were previously called as Bros, Sisters, Sister Sqaud, Squad and are now 9 year olds. True 9 year olds are those who did their part, such as Mr.Beast. Do your part, and subscribe to pewdiepie

If it's a 9-year-old, it's subscribed to PewDiePie.

What Pewdiepie calls his fans.

History:
PewDiePie uploaded a reaction video, Alinity made a response video (I can’t call it an apology video just because), and that video was reviewed by PewDiePie. Alinity mentions PewDiePie having 9-Year Olds as his fanbase.

Fans/subscribers of Pewdiepie
Anyone who watches Pewdiepie, regardless of their age, is referred to as a 9-year-old.

A boy who plays Call of Duty and tells his mom to bring him energy drinks, then cussing her out for bringing him Red Bull instead of Monster, then cussing you out incorrectly for shooting him.