An expression which originated during a drunken late-nite discussion of the origins of expressions. It means, "I see what you're saying, where you're going with that."
Drunk person A: "Dude, you know what I mean?!"

Drunk person B: "Totally, Dude. I'm riding that train, reading that book."
by ripcurlgirl September 15, 2004
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Same as saying, "I feel you."
Cool Person A: "So then, I told the guy that there was no way I would ever consider his lame-ass job, you know?"

Cooler Person B: "Yeah, man. I'm riding that train, reading that book. . ."
by InThaNo July 12, 2007
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