Top Definition
any of the variety of hallucinogenic mushrooms that contain psilocin, most commonly psilocybe cubensis or any psilocybes. shrooms a.k.a. magic mushrooms.
that fucktard ate way too many sillycybin shrooms again! he's gonna be comatoast!
by john moritz August 24, 2003
3 Words related to sillycybin

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