It is December 23rd. The day before Christmas Eve. If you want to shop last minute for presents, you should go on this day instead of Christmas Eve because it will be somewhat less crowded.
cunt #1: Shit, I need to buy presents. Should I go today or just go tomorrow which is Christmas Eve.
cunt #2: Bitch, hell to the no. Go today, Christmas Eve Eve. The stores won't be as packed as they will be tomorrow.
The evening before hump day, Tuesday night. Hump day eve is celebrated to justify the consumption of alcohol or other activities that would normally be confined to hump day.