Can be used as an noun (nooch), describing someone as noochy is to call them very cute and silly.
Can be used as an adjective (noochy), describing someone as noochy is to describe them as very cute and silly.
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......"