song released by some of the Muppets years ago which went something like this.....
Meh-Nah, Meh-Nah,
Do Dooo Di Do Dooo,
Meh-Nah, Meh-Nah,
Do Do Do Do,
Meh-Nah, Meh-Nah,
Do Dooo Di Do Dooo, Di Do Dooo, Di Do Dooo, Di Do Di Do Di Do Do Doo Do Doo
I had it on a tape I got when i was about 5 or 6 years old - it's possibly still in my parents house. It was called "Pop Hits for Kids" and had a clown on the front!
Mah Na Mah Na" is a well-known song, written in 1968 by Piero Umiliani as a soundtrack for the softcore documentary Svezia, Inferno e Paradiso (Sweden, Hell or Heaven) about sexual activity in Sweden.