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1.
A rather tasty cocktail made with Jägermeister and Mountain Dew. Best enjoyed whilst watching your team take the fucking Stanley Cup and made popular by the webcomic Hockey Zombie
"Dude, I had like 6 Mountain Don'ts and passed out before the third period!"
by TheFloyd May 29, 2007
 
2.
Generic replacement for Mountain Dew that one shouldn't purchase. Mello Yellow is considered generic as it is not Mountain Dew; despite it being produced by Coca-Cola. Most Mountain Don't's are produced by individual supermarket companies.

Characteristics of so-called Mountain Don't's include flat taste, lack of effect, and blandness.
Heee Haw (Hy-Vee), Citrus Drop (Kroger), Kountry Mist (Winn-Dixie), Mountain Breeze (Safeway), Mountain Lightning (Wal-Mart), Mountain Lion (Food Lion), Mountain Maze (Albertson's) and Moon Mist (Shasta/Faygo) are all Mountain Don't's.
by Justin Herbert April 10, 2009
 
3.
A drink for the future. I will be inventing it so nobody steal my ideas...It will have a lemony, peachy, watermellony, orangy, grape, fruit punchy taste to it and will have (in a 24oz bottle) 10oz of vodka!
yo dude, that Mountain Dont tastes pretty sweet. May need to buy it s'more
by Magic January 22, 2005