If desired, drizzle the inside of a serving glass with chocolate syrup. Place the glass in the freezer while you prepare the drink.
In a blender, combine the vodka, coffee liqueur, Irish cream liqueur, raspberry liqueur, and vanilla ice cream (or crushed ice).
Blend until the mixture is smooth and has a thick, milkshake-like consistency. Add a splash more ice cream or a little milk if needed to reach desired consistency.
Pour the blended mixture into the prepared glass.
Garnish with fresh raspberries if desired. Serve immediately.