It's a shortened version of 'Not Sure 2023' and mc well, that rhymes with Twenty-Three. And, since I am not from Wisconsin, Minnesota, or Michigan, I don't use the saying, "Twenty-Three, Ski-Doo!" Does it mean anything? You would have to ask someone from those 3 States, I suppose. As for my Theme? That took me 2 hours of trial and error. Not worth elaboration. God Bless, and Enjoy!!