Citations:off one's tree

Adjective: "(idiomatic) crazy; unhinged; irrational"

 * 1989, Robert McLiam Wilson, Ripley Bogle, Arcade Publishing (1998), ISBN 1559704241, page 192:
 * Deirdre was increasingly off her tree in the last sad days of our relationship. Her demands and quirks were ever more extravagant and dislocated.
 * 1992, Geoff Goodfellow, Triggers: Turning Experience into Poetry, Wakefield Press (1992), ISBN 1862542767, page 75:
 * When I wrote the poem I imagined 'Jim' coming home in the early hours of the morning, a few 'cones' inside him, and not really wanting to hear the old man going off his tree again. He anticipates his father's wrath and pre-empts it with his refrain,
 * 1994, Tom Wells, The War Within: America's Battle Over Vietnam, iUniverse (2005), ISBN 9780595343966, page 391:
 * "These guys were off their tree," David Hawk recalled. At one point, a VMC activist asked the Weathermen what they were really after. "To kill all rich people," Ayers replied.
 * 2010, Anouchka Grose, Why Do Fools Fall in Love: A Realist's Guide to Romance, Tin House Books (2011), ISBN 9781935639008, page 92:
 * But after her wedding he goes completely off his tree, runs off into the wilderness and starts ranting in verse and writing poems in the sand with a stick.
 * 2010, Paul Worstelling & Jack Crowley, Fishing Western Port, Australian Fishing Network (2010), ISBN 9781875228171, page 12:
 * Anglers in the UK would go off their tree if they could experience the gummy fishery that we take for granted.