Do you know ghouls from goblins and ghosts?
1816, American English dialectal contraction of ordinary (adj.). "Commonplace," hence "of poor quality, coarse, ugly." By c.1860 the sense had evolved to "mean, cantankerous." Related: Orneriness.
Mean and irascible; ill-tempered: He wasconfident and ornery on the mound
[1816+; fr a dialect pronunciation of ordinary]