1 (1.5 fluid ounce) jigger vodka
1 (1.5 fluid ounce) jigger triple sec (orange-flavored liqueur)
3/4 cup pineapple-orange juice
Pour the vodka, triple sec, and juice into a cocktail shaker over ice. Cover, and shake until the outside of the shaker has frosted. Strain into a chilled glass to serve.