An expression deemed only to those situations worthy of a stoner's complete gratification. Similar to when people say "Hell ya" or "Shitzchea" all terms used extensively to show great pleasure in a certain action or on hearing an idea. A term even when yelled, is said in a very calm and layed back manner.
A: "Yo, I just found your dimebag behind the couch"
B: "Snooch to the Nooch...."
Of course other words are sometimes added to the term such as "biotch"
"Snooch to the Nooch Biotch......"