In a cocktail shaker with ice cubes, combine eggnog, vodka, pumpkin puree, and cinnamon. Strain into 6 shooter glasses.
To make the meringue, whisk egg whites and sugar using an electric mixer until stiff peaks form. Place into a piping bag fitted with a medium star tip and pipe over the top of the shooters. Use a torch to lightly caramelize the meringue. Serve immediately.