Yesteryorrow
Yesteryorrow, or Yester-yorrow is the word used when talking about the day before yesterday.
The day after tomorrow is simply yorrow
The day after tomorrow is simply yorrow
"I still can't believe how funny it was when we got attacked by them geese at the barn yesteryorrow!"
"Lets just hope it doesn't happen when we go back yorrow!"
"Lets just hope it doesn't happen when we go back yorrow!"