Top definition
Usually a term used to describe the best day ever;
The term is usually used in professional golf tournaments

When a players posts an unbelievable round leading to a victory.
The term originated at the 2015 Barclays in Plainfield, New Jersey
Jordan Speith was having himself a sang moon day when he won the U.S Open.
by Sang moon day October 14, 2015
Get the mug
Get a sang moon day mug for your Uncle Trump.