Top Definition
The process by which white, pristine, beautiful snow becomes dirty, black, crusty, and disgusting. Basically, a metaphor for what humans have done to the planet.
Oooo it snowed a foot last night! Let's go out and enjoy the beauty before it snirtifies!

All that runoff from the sewage plant really snirtifies this new snow a lot faster!
by HankyMoody420 February 26, 2011

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