What does Tee nah nah mean?

Having researched this for hour's, I have come to the conclusion that it is just sounds, i.e. the "FaFaFa" song by Otis Redding. Overton Lemons, who came to be known as Smiley Lewis, wrote the song. A successful entertainer in New Orleans, La.

search for Smiley Lewis on Allmusic.com, Google, etc. for more details of his musical talent.