It's sort of a dessert kind of punch.
In a large punch bowl or cooler, scoop in 2 gallons of lime sherbet, then
add three 2-liter bottles of 7-Up or Sprite, and a 1-liter bottle of Bacardi
151 rum. Stir the mix until the sherbet melts. Then add a bag of ice.
This concoction is called Sherbet 151.