Somemorrow Share definition Flag An unidentified day of the week. Often used to help put off real world responsibilities. I was going to go get my haircut today during lunch, but I think I'm going to go drink a beer instead and do that somemorrow. Somemorrow by JayBeer December 22, 2015 0 0 Get merch Get the Somemorrow mug. Buy Now — $32.95 See more merch