Hi Rachel,
I found this recipe for you, I hope it's the one you are looking for.

POPCORN BALLS

1/2 cup sugar
1/4 cup margarine or butter
1/2 cup light corn syrup
1/2 tsp. salt
8 cups popped corn
few drops food coloring, optional

Heat all ingredients except popcorn to simmering in dutch oven over medium-high heat, stirring constantly.

Stir in popcorn. Cook, stirring constantly, until popcorn is well coated, about 3 minutes: cool slightly.

Dip hands into cold water; shape mixture into 8 balls about 2 1/2-inches. Place on waxed paper; cool completely.

Wrap individually in plastic wrap, or place in plastic bags and tie.

VARIATIONS:

CARAMEL POPCORN BALLS:
Substitute packed brown sugar for the granulated sugar and dark corn syrup for the light corn syrup: omit food coloring.

CHOCOLATE POPCORN BALLS:
Add 2 tbsps. unsweetened cocoa powder with the sugar; omit food coloring.