Sutema Otsu
ステマ乙
Definition
Sutema = Stealth Marketing. Like that can of Coke in your blockbuster movie. That's stealth marketing.
The Otsu is a slang abbreviation for Otsukaresama which means "thank you".
Also
May refer to the villain group in Hikounin Sentai AkibaRangers AkibaRanger Villains