1 (46 fluid ounce) can pineapple juice
2 cups coconut-flavored rum
2 cups vodka
1 (6 ounce) can frozen orange juice concentrate
1 (6 ounce) can frozen pink lemonade concentrate
1 cup chilled brewed black tea
1 tablespoon grenadine syrup
1/4 cup lemon-lime carbonated beverage, or as needed
Mix pineapple juice, coconut-flavored rum, vodka, orange juice concentrate, pink lemonade concentrate, black tea, and grenadine together in a freezer-safe container.
Freeze mixture, stirring occasionally, until frozen, about 24 hours. Serve slushie in a glass and top with lemon-lime beverage.