Jackleg, adj., is a Southern adjective meaning inept, unprofessional, or dishonest.
It is usually applied to members of a particular occupation.
You do not, for example, want to take your car to a jackleg mechanic.
The term dates to 1837.
It may be from an older term, a jackleg knife or jackknife, perhaps first applied to carpenters who used jackleg knives.
Jackleg knife dates to 1786.

For some time many of us have wondered just who is Jack Schitt?
We find ourselves at a loss when someone says, "You don't know Jack Schitt!"
Well, thanks to my genealogy efforts, you can now respond in an intellectual way.
Jack Schitt is the only son of Awe Schitt.

Awe Schitt, the fertilizer magnate, married Miss O. Needeep They had one son, Jack.

In turn, Jack Schitt married Noe Schitt. The deeply religious couple produced six children: Holie Schitt, Giva Schitt, Fulla Schitt, Bull Schitt, and the twins Deap Schitt and Dip Schitt.

Against her parents' objections, Deap Schitt married her cousin Dumb Schitt, a high school dropout. After being married 15 years, Jack and Noe Schitt divorced.

Noe Schitt later married Ted Sherlock, and, because her kids were living with them, she wanted to keep her previous name. She was then known as Noe Schitt Sherlock.

Meanwhile, Dip Schitt married Loda Schitt, and they produced a son with a rather nervous disposition named Chick N. Schitt.

Two of the other six children, Fulla Schitt and Giva Schitt, were inseparable throughout childhood and subsequently married the Happens brothers in a dual ceremony.

The wedding announcement in the newspaper announced the Schitt-Happens nuptials.

The Schitt-Happens children were Dawg, Byrd, and Hoarse. Bull Schitt, the prodigal son, left home to tour the world. He recently returned from Italy with his new Italian bride, Pisa Schitt.

Now when someone says, "You don't know Jack Schitt," you can correct them.