1. When a 2 liter bottle of soda, typically reserved for chasing shots, is chugged by the stranger at the party (typically from somewhere they say pop, i.e. Minnesota) not drinking alcohol
2. When someone brings a 2 liter bottle of soda to their friends' place fo' free
Free pop?!!" (strange ugly kid chugs 2 liter bottle of orange soda) "Hey guys, they've got free pop!