n. a story or argument; a story intended to seduce someone. (See also lines.) : Don't feed me that line. Do you think I was born yesterday?
n. and rail. a dose of finely cut cocaine arranged in a line, ready for insufflation or snorting. : Let's you and me go do some lines, okay? , The addict usually “snorts” one or two of these “rails” with some sort of a tube.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
rail (n.1)
"bar," c.1320, from O.Fr. reille, from V.L. *regla, from L. regula "straight stick," dim. form related to regere "to straighten, guide" (see right). Used figuratively for "thinness" from 1872. Technically, railings (1471) are horizontal, palings are vertical.
[reyl] 
