Using a butter knife (or a small offset spatula), spread marshmallow fluff around rims of glasses. Add shredded coconut to a shallow bowl, then dip the tops of glasses in coconut, adhering the coconut to the fluff.
In a large pitcher, stir together coconut milk, tequila, triple sec, pineapple juice, and lime juice.
Add ice to glasses then pour over margarita mixture.
Recipe by Cooking TV Recipes at https://cookingtv-channel.com/cottontail-margaritas/