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Refers to any strain of marijuana so incredibly rare and potent that it may as well be mythological. Not to be confused with "celebrity" strains such as White Widow or chronic weed (marijuana laced with cocaine).

Unicorn strains are generally nameless yet will produce an extremely powerful high comparable with that of any premier breed. Such marijuana is typically produced by only a handful of minor or private growers, leading to its obscurity and low circulation.
This bud is ridiculously good, you're not going to run into weed like this again for long time. It's fucking unicorn weed man.
by Pete the Cheat December 16, 2009
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