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1.
A Douchebag who loves climbing, wearing clothes purchaced from REI, and generally has an outdoorsy air about him.
I saw a mountain douche at the top of Mt Si eating a Cliff bar like an idiot.
by Most Of The Sun August 24, 2010
 
2.
1. A song by the band Fecal Dick.
2. What you look like when you drink Mountain Dew.
1. I'm going to dedicate the song "Mountain Douche" to my ex, because he IS a mountain douche.

2. Check out the mountain douche to your right.
by shitstain4 April 16, 2010
 
3.
The act of pouring a whole 2 litter of mountain dew into the girls vagina.
I totally gave your mom a mountain douche last night.
by Mr. Dickass February 03, 2007