Shiffaroe
A hard substance (harder than dolemite) that white slavemasters and overseers used to make slaves toil over for endless hours at a time.
Slave 1: Cum own Kunta, let's go own down by 'da river 'n rest a spell.
Slave 2: I kain't. I'zz to busy bustin' up dis Shiffaroe!
Slave 2: I kain't. I'zz to busy bustin' up dis Shiffaroe!