DW Ditty and Argenine, here are the lyrics you mentioned.

Is You Is Or Is You Ain't (Ma' Baby)
sung by Bing Crosby & The Andrews Sisters
- written by Billy Austin and Louis Jordan
- from the Universal picture "Follow The Boys"
- as recorded June 30, 1944 in Los Angeles by The Andrews Sisters with Bing Crosby and Vic Schoen & His Orchestra.

I got a gal who's always late
Anytime we have a date,
But I love her, yes I love her.

Mmm, he's gonna walk up to my gate
And see if he can get it straight,
'Cause he wants her, he's gonna ask her:

"Is you is or is you ain't my baby?
The way you're actin' lately makes me doubt.
You's is still my baby, baby.
Seems my flame in your heart's done gone out!"

A woman is a creature that has always been strange;
Just when you're sure of one, you find she's gone and made a change.

Is you is or is you ain't my baby?
Maybe baby's found somebody new,
Maybe baby's found somebody
Or is my baby still my baby true?

Is you or is you ain't my baby, baby?
Baby boy, the way you're actin' lately makes me doubt.
See here, who's been cuttin' me?
You's is still my baby, baby
Baby boy, it seems my flame in your heart's done gone out!
Oh, blackout

A woman is a creature that has always been strange;
Just when you're sure of one, you find she's gone and made a change,
And took my change.

Is you is or is you ain't my baby?
Maybe baby's found somebody new?
Maybe baby's found somebody--
Is my baby still my baby true?

HTML line breaks added. --JoeClone, 21-Feb-02.