Every time I hear the words ya ya I think of this song, YA YA by Lee Dorsey and I start singing the only lines I know:
"Oh well I'm uh, sitting here la la, waiting for my ya ya a hm uhm".
It's still catchy after all these years, a finger-snapping, rhythmic, happy tune. It reached #1 on the R&B singles chart in 1961 and #7 on the Billboard Hot 100 the same year.
It was still popular when I was young, which was long after it was written. It's been redone by several artists over the years, namely John Lennon (Rock 'n' Roll - 1975), Yoko Ono, Randy Newman and most recently by Steve Miller in 1988 on the album Born 2 B Blue and by french singer Mitsou (a Quebec pop singer) in 1994.