Top Definition
Happily lacking seriousness or responsibleness; deliriously carefree; frivolous. Emotion/characteristic brought on by the effects of low to medium amounts of Hallucinogenic (Psilocybin) mushrooms.
About 30 minutes after billy ate half the eighth of shrooms, he was feeling and acting quite psilly.
by Corporal Barbier February 16, 2004
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