(Adjective) Vernacular referring to a bag of illicit substances that contains noticeably less "stuff" than was advertised, but not so much less that the purchaser will do anything more than grumble slightly. For bags missing much more of their content, see "fucked over".
"Goddammit this is a fucking shady bag! A quarter ounce that weighs barely 6 grams... WITH the fucking bag?!"

or

"If that mother fucker sells me one more shady bag I'm gonna take a pair of bolt-cutters to his fucking taint."
by Astro-Smoker April 01, 2010
the bag that heroin users keep all there heroin tools in.
go grab the shady bag. i need my set and spoon.
by aw1322 January 06, 2010

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