There’s a good chance you’d confuse anyone born after 2000 if you told them you were planning to go watch the “boob tube.” They’d likely raise their eyebrows at you and think it was a new website for adults.
People assign nicknames to many frequently used objects, including TVs. The term “boob tube” dates back to the 1950s when a popular newspaper column TV critic, William Ewald.
At the time, “boob” was associated with a foolish person or someone participating in silly behaviors. They were, as Dwight Schrute would say, an idiot. To be called a “boob” was not a compliment.