Not specifically stoner moveis but fun to watch when stoned...and definitely cult classics...

Killer Clowns from Outer Space is always a riot.

An old sci-fi movie/cult flick called Dark Star. It's about these
guys whose job it is to cruise around space and blow up unstable stars. Special effects are iffy at best but the conversations with the bomb are a riot.
bonsaiguy Reviewed by bonsaiguy on . The Ultimate In Stoner Cult Movie Classics Off Color Films http://www.offcolorfilms.com offers the most unusual viewing experience of the greatest cult classics of all time. Each includes a running commentary by Mike Nelson of Mystery Science Theater 3000 as a special feature. The restored black and white version of each film is also included along with the fully colorized and restored version. This is not your Dad's colorization. The process is beyond your wildest expectation. Visit the site for trailers. As an added Rating: 5