n. poor quality marijuana. (Drugs.) : This isn't good grass; it's lawn.
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
lawn (2)
"thin linen or cotton cloth," 1416, from Laon, city in northern France, center of linen manufacture. The town name is O.Fr. Lan, from L. Laudunum, of Celtic origin.