have kangaroos in the top paddock
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have kangaroos in (one's)/the top paddock
To be crazy; to act, think, or behave in an eccentric, foolish, or nonsensical manner. Primarily heard in Australia. Tommy must have kangaroos in the top paddock if he thinks he can convince our mother to let him get a tattoo for his birthday. There's an old lady who stands on the corner yelling at strangers all day. I think she might have kangaroos in her top paddock.
have kangaroos in the (or your) top paddockbe 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.’