World English Dictionary
supergrass (ˈsuːpəˌɡrɑːs)
an informer whose information implicates a large number of people in terrorist activities or other major crimes

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Slang Dictionary

supergrass definition

  1. n.
    high-quality marijuana. : The cannabis that is the richest in resin is sometimes called “supergrass.”
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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