off the chain
adj.— «Off the chain: An inmate term, not necessarily derisive, for officers acting slightly wacky or making wisecracks at inmates. As in, “Looks like the sergeant’s off the chain today.”» —“What the lingo means” by Adam C. Smith, Jo Becker St. Petersburg Times (Florida) Dec. 30, 1999. (source: Double-Tongued Dictionary)
Further reading
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