1 1/2 oz light rum
1 tbsp triple sec
1 banana
1 1/2 oz lime juice
1 tsp sugar
1 cherry
Combine all ingredients (except for the cherry) with 1 cup crushed ice in an electric blender. Blend at a low speed for five seconds, then blend at a high speed until firm. Pour contents into a champagne flute, top with the cherry, and serve.
I'm not sure as I'm a Beer drinker, but that sounds like a Banana Daiquiri to me