OK, so we have the new Trace Adkins release and it's called "Brown Chicken Brown Cow". What does this mean?

I've heard it said many times over the years, somehow I don't get it. Is it an old saying that means something? Someone please let me know.

Ooh
Bobby Joe and Betty got a real nice farm
Everybody knows that they work real hard
Bobby Joe sweatin' in the noonday sun
Betty right beside him 'til the work's all done
But every now and then they get a strong desire
To crawl up in the hay and set the barn on fire
Now the hay needs haulin', the hogs needs slop
The corn needs cuttin' but the tractor's stopped
They climbin' up the ladder, clear to the loft
Shuckin those dirty ol' work clothes off
Singin' brown chicken brown cow
(Ain't nobody watchin' but the)
Brown chicken brown cow
Yeah
Black crow sittin' on a weather vane
He can see 'em comin' from a mile away
Yeah, he's call-call-callin' out a loud alarm
Hey ol' Bobby Joe and Betty headin' for the barn
Now the chicken ain't peckin' and the cow won't eat
They're fightin' each other for a front row seat
Ha-ha
Now the hay needs haulin', the hogs need slop
The corn needs cuttin' but the tractor's stopped
They climbin' up the ladder, clear to the loft
Shuckin' those dirty ol' work clothes off
Singin' brown chicken brown cow
(Ain't nobody watchin' but the)
Brown chicken brown cow
Yeah
Now the hay needs haulin', the hogs need slop
The corn needs cuttin' but the tractor's stopped
They climbin' up the ladder, clear to the loft
Shuckin' those dirty ol' work clothes off
Singin' brown chicken brown cow
(Ain't nobody watchin' but the)
Brown chicken brown cow
(Ain't nobody watchin')
Brown chicken brown cow
(Ain't nobody watchin' but)
Brown chicken, brown cow
Only one watchin', baby
(Ain't nobody watchin')
Oops

source: Trace Adkins Song "Brown Chicken Brown Cow"