Sandlin is an old Scottish word that is equivalent to modern day's use of Awesome.
To say someone or something is Sandlin, you are in fact calling them Awesome.
The term originated in the Sandlands of Scotland where the Sandlin clan was known as being the best of the best. The bravest warriors and the most beautiful clan's Men and Woman anywhere to be found!
You are so Sandlin, I wish I could be as Sandlin as you!