Preheat oven to 350°. Coat standard bundt pan with non-stick cooking spray. Dust with flour, shake out excess.
With electric mixer, beat cake mix, melted ice cream, & eggs in a bowl for 3 minutes on medium speed. Scrape into prepared cake pan.
Bake at 350° for 40 minutes or until tooth pick comes out clean. Cool pan on wire rack 20 minutes.
Frosting: In a large bowl, beat cream cheese, sour cream, butter, liqueur & vanilla on medium speed until light & creamy (2 mins or so). On low speed, gradually beat in confectioners sugar, about 1 to 2 minutes. Refrigerate while cake cools.
Once cake is cool, spread frosting over top & sides. Refrigerate until ready to serve. Dust with cocoa.