Gallon Challenge 

The game by which a participant must drink an entire gallon of milk within an hour without vomiting.

After attemping the Gallon Challenge, I had to clean the floor and buy a new shirt.

Gallon Challenge by Brozi November 29, 2004

Ghetto Gallon Challenge 

Bringing a large amount of any beverage to school or work and drinking it all before lunch. You can also go head to head to see who can drink it all first.

Trey: What are sabby and jenn doing?
Jenn: Just the ghetto gallon challenge fool.

Ghetto Gallon Challenge by JennJennx3 March 9, 2009