What is Rough As A Cob?
1.
In earlier times, a corncob was used by some for personal hygiene concluding a visit to the outhouse. To say that one is "rough as a cob" is to note their abrasive manner, or unpolished style of approach usually in regard to communications or actions.
You know John ain’t got no smarts, he’s as rough as a cob.
See
2.
Mighty unpleasant.
From the rough surface of a corn cob used to wipe one's backside.
"Hey Elmore, the wheel done fell off mah baler."
"Oh man, Ermal, that's rough as a cob."
