An ugly prank played after camping with one's best friend or girlfriend and eating a generous amount of grilled hot dogs or Brats. The pair hike to a nearby summit (preferably one of 8000' or more). Once at the summit and both persons are ready to expel the winers, the prankster takes initiative to find a viewable open location to do the deed. The prankster drops his/her pants whilst yelling to the prankee to look towards their bare ass, which should then be blowing mud toward the prankee as they look over. Hence the Filthy Mountaineer.
We hiked and hiked. Suddenly, I really had to go shit so I dropped my pants in front of Cindy and gave her a Filthy mountaineer!
by J>C>B March 5, 2008

by thecumdown September 5, 2012

by dellro January 19, 2008

Mountain ash is a town where all the ard cunts live, u like it or leave it
WATCH OUT FROM THE 45!!!!!
Joking there all fags
WATCH OUT FROM THE 45!!!!!
Joking there all fags
by C2bunney September 29, 2022

Norwegian, mostly the big, blonde, slightly chubby one who goes to get drunk on cheap beer in Denmark
Look, there's beer and puke and broken everywhere in this bar. Those Mountain Monkeys are such barbarians!
by Skrukk November 15, 2016

noun: when laying in your bed under the sheets with a boner that pushes the comforter up to a peak resembling a mountain.
The other day my mom came into my room and i had a mountain boner, so i had to roll over onto my side until she left.
by kseng14 September 29, 2009

An act where several men, often ones who know each other, dogpile on one another while chanting "dude mountain".
by sdrawkcaBsihTgnidaeRerAuoY May 7, 2016
