Ah, my first source was crappy. I got it now. Paddy rollers were slave patrols who rounded up runaways.

Anyway, I encounted the word in the song 'Run, Nigger, Run" by the Skillet-Lickers so I was curious.

Oh run nigger run well the pattyroller will get you
Run nigger run well you better get away

Run nigger run well the pattyroller will get you
Run nigger run well you better get away

Nigger run nigger flew
Nigger tore his shirt in two

Run run the patty roller will get you
Run nigger run well you better get away

Nigger run, run so fast
Stoved his head in a hornets nest

Run nigger run well the pattyroller will get you
Run nigger run well you better get away

Nigger run through the field
Black slick coal and barley heel

Run nigger run the pattyroller will get you
Run nigger run well you better get away

Some folks say a nigger won't steal
I caught three in my corn field
One has a bushel
And one has a peck
One had a rope and it was hung around his neck

Run nigger run well the pattyroller will get you
Run nigger run well you better get away

Run nigger run well the pattyroller will get you
Run nigger run well you better get away

Oh nigger run and nigger flew
Why in the devil can't a white man chew

Run nigger run well the pattyroller will get you
Run nigger run well you better get away


Hey Mr. Patty roller don't catch me
Catch that nigger behind that tree

Run nigger run well the pattyroller will get you
Run nigger run well you better get away

Nigger run, run so fast
Stoved his head in a hornets nest

Run nigger run well the pattyroller will get you
Run nigger run well you better get away

Nigger run, run so fast
Nigger, he got away at last

Run nigger run well the pattyroller will get you
Run nigger run well you better get away