look up any word, like rimming:
 
1.
Originated from the sound made at the closing of the "Family Ties" theme song. Used after something incredibly dynamic or cool is said or done.
Your friend: "Hey, so I ran into the ho Carly. You know, the one who gave Kirk herpes. Yeah, I told her she smells."
You reply: "Sha na na na!"
by Brendan April 28, 2003