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1.
(noun) Mountain Dew served from a restaurant fountain. Much fizzier, less caffeinated, and more watery than its bottled counterpart.
A: What do you wanna drink? They have Mountain Dew.
B: Nah. That's Fountain Dew. Apples and oranges, dude.
by Rochelle Affleck September 11, 2005
 
2.
The nasty fountain dispensed Mountain Dew that you order against your better judgement going in the drive thru of your local Taco Bell.
*Drive thru lady* "Would you like a drink with your 'Cheesy Double Beef Burrito?'"

*You* "And pay for that nasty fountain dew you're passing as drinkable liquid? I think not, I'll get a water."
by 12_Gauge March 03, 2009