It's an old Bob Wills song:
Working on the railroad, sleeping on the ground,
Eating saltine crackers ten cents a pound.
[Chorus:]
Big ball's in cowtown - we'll all go down.
Big ball's in cowtown - we'll dance around.
(Ehhhh, come in momma, the hog's done got me).
I'll go to cowtown, I'll dance around.
Board up your windows - big ball's in town.
[Chorus]
Put on your new shoes, put on you gown.
Shake off them sad blues - big ball's in town.
[Chorus]
Everybody's smiling, you can't find a frown.
Girls are all happy 'cause big ball's in town.
[Chorus]
Big ball's in cowtown - we'll all go down.
Big ball's in cowtown, big ball's in town.
My mom got in big trouble for singing "Big Balls in Cowtown" at lovely Camp Mystic for Girls in Hunt, Texas in the late '40's! What a hoot to see it quoted here.
Can't believe I didn't know that song.