Yum. Yum. Yum.
In a 9×13 inch pan, mix Oreos and melted butter. Press to make crust. Freeze 30 minutes. Spread coffee ice cream over crust. Freeze 1 hour. Spread a thick layer of hot fudge sauce over ice cream. Freeze 1 hour. Spread Cool Whip over hot fudge sauce. Freeze 4 hours.