On'ry is an adjective and is a truncated version of the word "ornery". In the Baltimore, Maryland area, use of the term "on'ry" is quite common. In fact, in some of the Baltimore suburbs, reports have surfaced of locals beating down visitors for using "ornery" as opposed to the shortened, less complicated "on'ry". Attempts to question locals regarding this issue are usually met with a blank stare or an open-mouthed gaze downward.
Da-y-am...I'm gettin' on'ry 'cause da price a cigarettes done wen' up ag'in. An' they also jack'd up da price a Coors Light, uh, y'know, so ye'h I'm sure gettin' ev'n on'ryer now!
Originally meant as a reference to Honoré de Balzac, a writer whose works were banned in many countries during the 1800's, infering a similar character of inflamatory manner or lurid behavior. Being or feeling "Onry" (Anglized form of the french name Honoré)eludes to a person being like the work of the banned author. This reference has been lost to general use but the word remains.
"I don't know why he cut up all your panties...he was just being onry, I guess."