have kangaroos in the top paddock

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have kangaroos in the (or your) top paddock

be mad or eccentric. Australian informal
1985 Peter Carey Illywacker ‘And he was a big man too, and possibly slow-witted.’ ‘Leichhardt?’ ‘No, Bourke…He had kangaroos in his top paddock.’
See also: have, kangaroo, paddock, top