关于Mainline的意思和用法的提问

A: "Mainline" here is used in its slang verb form, "to inject directly into the veins."

It comes from drug use, probably heroin. I don't know for certain:

"Line," like a train-line to the bloodstream to feel a high. The main-line into the blood stream is an injection with a hypodermic needle, skipping the slower lines of the nose, the mouth or any other orifices of the body.

It's an expression to mean "I will consume an exorbitant amount of _____, as if I had an addiction to it" and is usually meant humorously and hyperbolically.

A similar expression is "I will binge ____," which comes from an alcohol binge, a long period of drinking and drunkenness."

A: Train station.

A: To mainline is a drug term, as retinagland said. It means to inject a drug directly into the vein in order to produce the fastest and most intense high. It is used as a metaphor here to say that when he had one of his visions, it felt like he was directly injecting the secrets of the universe into his body and he was on an intense high produced by them.