How disheartening ... At least I sited two examples that intended the term "Ya Ya" as something other than a body part - but wait!! - maybe then a "Race Car Ya Ya" is just an "ass" behind the wheel? (Hhmm ... the lyrics in the song might be interpreted to support this notion). AND, the 1961 Lee Dorsey tune could easily be twisted into -
Oh, well, I'm, UH!, sittin' here,la la
Waitin' for my ass (ya ya), ah-um, ah-um
A sittin' here la la, waitin' for my ass (ya ya), ah-um, ah-um
It may sound funny but I don't believe she's comin', ah-um, ah-um