Mountain Dew is a highly-caffeinated citrus-flavored carbonated soft drink brand produced and owned by PepsiCo. The Mountain Dew brand and production rights were acquired by the Pepsi-Cola company in 1964, at which point its distribution expanded widely across the United States.
When mixing equal parts Yukon Jack and Mountain Dew, one creates a mixed drink that is smooth, sweet with a citrusy flavor, yet gives a gentle buzz due to the combination of alcohol and caffeine. It has the magic property of helping separate women from their clothing.
Dude: "Why bro?"
Stud: "Because we mix it and make Yukon Dew. Its liquid panty remover! It'll help us get laid by midnight!"