Junk Energy Drink is an energy drink appearing in Grand Theft Auto V.
It is much like real life energy drink companies such as Monster Energy or Red Bull. The term Adrenaline Junkies is one of many references to Junk Energy Drink. Junk could also be a reference to the slang for penis. This is further supported by the syringe, which looks like someone masturbating.
It is one of the sponsors for the North Point Trim Track in Paleto Bay, as well as the Fame or Shame TV show. Going to their in-game webpage will lead the player to a link that shows all the stunt jumps over San Andreas.
As written from their webpage in game. "We have rooms full of advertising wonks whose only job is to come up with these slogans, because we are passionate about the under-25 demographic and their reckless lifestyle. You're the social media generation. You don't work hard but you play hard. You care about self expression but have no idea what it means."