from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Informal Distraught or restless from long confinement in or as if in prison.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of a prisoner, mentally unbalanced due to prolonged incarceration.
- adj. By extension, restless, uncomfortable, or impatient due to inactivity or confinement.
First attested around 1925, from prison slang "stir". See , . (Wiktionary)