seceshercolloq.U.S.|sɪˈsɛʃə(r)| [f. secesh + -er1.] A secessionist. 1861O. W. Holmes Sweet Little Man 47 While the wind scatters the chaffy seceshers.1861Lowell Biglow P.Ser. ii. i. Poems 1890 II. 239 Knowin' t' much might spile a boy for bein' a Secesher.