In Girl Scouts, we learned the song as follows:

This way, Willoby, Willoby, Willoby,
This way Willoby all night long.

Step back Sally, Sally, Sally
Step back Sally all night long.

Call the doctor and the doctor said
"Got a pain in my head and it hurts"
"Got a pain in my back and it hurts"
"Got a pain in my side and it hurts"

Really, really sick in bed
Really, really sick in bed.
Oomp chee wah wah,
Oomp chee wah wah.

Lookin' down the alley, what do you see?
I see a big fat mamma from Tennessee.
She wears her dresses down to her knees,
And she shakes, shakes, shakes from Tennessee.

This way, Willoby, Willoby, Willoby,
This way Willoby all night long.