Lockensmur

Lockensmur means the day after tomorrow.
Two days into the future. If today is Wednesday, lockensmur would be Friday.

A. Are you going to the big party lockensmur?
B. Sadly, I won't be able to go because I have to go to my niece's birthday party lockensmur.
A. Oh, I wish you could come.

Y. They are opening the videogame store tomorrow, and all of the good games will probably be gone by lockensmur.
Z. Ugh, I won't be able to get a good game because I only get my allowance on lockensmur.