Place 1 tablespoon of the sweetened condensed milk on a saucer.
Place the ground espresso and cinnamon on another saucer - mix well.
Dip the rims of the glasses into the sweetened condensed milk then roll in the ground espresso beans.
Combine the espresso, both rums, remaining sweetened condensed milk, and the coffee ice cubes in a shaker.
Divide the cocktail between the two glasses.
Add more coffee ice cubes as needed.
Make this a Brazillian Coffee Mocktail by leaving out the rum and adding espresso in its place. Top with whipped cream and espresso dust.Make it nondairy by using coconut milk. You'll need to add extra sugar to taste.