Certain other drinks can be called Boomer juice too, but they must be so called “healthy versions” of an already existing drink, meaning that they contain no sugar etc.
However, the Low Carb, No Sugar Monster is the original Boomer juice.
It is called Boomer juice because it is generally drank by the baby boomer generation, also called Boomers.
The Boomer juice originates from one of the Oomer Wojaks. Wojaks are simply drawn meme figures, and the Oomer Wojak series depict Boomers in their usual habitat
One of these images show the Boomer Wojak with the Low Carb, No Sugar Monster next to him.
It was first posted on 4chan may 4th, 2018.
Boomer memes and Wojaks are used to make fun of the baby boomer generation, as there has become an online war between the Boomers and the Millenials.
Millenials make fun of the Boomers for drinking Boomer juice, pretending like it is healthy while it actually being nearly just as harmful as any other energy drink.