Wiktionary
a. (context archaic regional informal English) secessionist, a supporter of the Confederacy during the United States Civil War.
Usage examples of "secesh".
The riotous plug-ugly element in Baltimore had been forcibly suppressed by outstate Union troops, but the Maryland legislature remained adamantly secesh, its outright rebel supporters joining with the Peace Democrats who had carried the state of Maryland for Breckinridge in the presidential campaign the year before.
When we reduce all those Mississippi forts, the secesh will wither away.
Missouri until the Secesh are subjugated and made to know that they are not only powerless, but that any attempts to make trouble here will bring upon them certain destruction and this .
Oliver Wendell Holmes, wheezing with nervousness as he watched Oliver Wendell Holmes Junior, wished that he might dive down into those fairy-tale tunnels supposedly running under the churches, for what use were those rabbit holes now that the Secesh traitors would be shown what to do with their slavery laws with bayonet and Enfield?
You know the secesh wanted Lincoln to win so they could walk out on him.
He is surely not one of those arrogant fire-eaters that usually do the arguing for the secesh more of a Hamlet, this one is, which is why the Tycoon is spending the time to save his soul from political perdition.
I called to congratulate you on your career, which has been a honest and a good one--unscared and unmoved by Secesh in front of you and Abbolish at the back of you--each one of which is a little wuss than the other if possible!
But then Wiechman had also, on a whim, sometime in March, told the clerks in the office that a Secesh plot was being hatched against the president in the very house where he roomed.
When John came back from Richmond he always brought gold, so the Secesh government did give money for secret jobs.
She wanted to hear all about how soon Bull Run made the Secesh leaders feel they would end the war.
I was down to the house of Winans the Secesh with a member of our company who is intimately acquainted with them.
My fellow passengers declared Maryland a no-good Secesh state, whose citizens deserved no better than the horsewhip or the noose.