Chill a martini glass by filling it with 1/2 cup of ice and cold water.
Place 1 cup of ice cubes into a cocktail shaker. Pour vanilla-flavored vodka, white creme de cacao, and Irish cream liqueur over ice; cover and shake vigorously.
Dump ice and water from the martini glass and drizzle the inside of the glass with chocolate syrup. Strain cocktail into the glass to serve.
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