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 17, 2008
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Another name for Coors lite, the worst beer known to man.
I can't believe Dave only brought Rocky mountain piss water, this party is gonna suck.
by Charmander311 March 24, 2018
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A derogatory name for Coors beer, or Coors beer that has gone bad in the can or bottle. The term was popular in the 1970's, when Coors was difficult to obtain in various parts of the USA. Adventurous beer enthusiasts would drive out to Colorado from east of the Mississippi and bring it back unrefrigerated.
Even if re-refrigerated, it was still skunked, considered swill,and difficult to drink.
"That stuff was in Tony's trunk for three weeks; I'm not drinking Rocky Mountain Gopher Piss."
by Nick Estes February 11, 2006
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I went to a FIJI party last night but all they had was rocky mountain goat piss, I was so pissed, at least give me some Bud!
by PhilZeller October 29, 2006
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A colloquial term used in reference to the popular sports / soft drink "Mountain Dew".
While hung over in the rocky mountains after a blinder night you may find a need to "get on the goat piss" in retrospect of the previous nights heavy drinking session.

In drinking such green coloured salty flavoured beverages some may comment : "Hard night eh?..On the goat piss I see" in reference to the consumption of the Rocky Mountain Goat Piss.

One would acknowledge this comment with a nod and knowing smile.
by Dj_Teknotimm August 5, 2011
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