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Mountain Lighting, the knock-off brand of Mountain Dew that tastes like horse piss. Often used in substitute of alcohol when playing beer pong because the effects are almost just as bad and because it's way cheaper.
-Wanna play some pong tonight?

-I'll get the mountain piss.
by CreeperStash June 16, 2008

Words related to Mountain Piss

beer pong mountain dew mountain lighting piss pong