Top Definition
1. n. precipitation that appears to be snowlike as it falls but melts in a pathetic, muddy, and/or unexciting fashion soon after reaching the ground.
2. n. marijuana. (Origins: in urban mythology, the condensation nuclei of the fail snow comes from marijuana smoke).
"My excitement turned to disappointment when I couldn't build a snowman: the snow turned out to be fail snow and melted right away."

"She was put in jail because she was caught smoking fail snow."
by Forgettable Nanny November 25, 2009

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