3/4 c. Kahlua
1/2 c. light rum
1/4 c. creme de cocoa
1/2 gallon vanilla ice cream, divided

Put Kahlua, rum, creme de cocoa and half the ice cream in a blender. Blend (using the on/off technique) until mixture is smooth. With motor on, gradually add remaining ice cream, blending until mixture is smooth.