Have a few kangaroos loose in the top paddock Australia verb phrase slang
Have eccentric ideas, behaviours or actions; be crazy
I think he has kangaroos loose in the top paddock when he just keeps talking to himself all day.
Jonas must have had a few kangaroos loose in the top paddock when creeping in that forest at midnight.
John might have had a few kangaroos loose in the top paddock when believing that he would pass the exam without any preparation.
Very stupid, or silly
A very offensive term used to describe an upper-class British man who is stupid or inexperienced
Stupid or crazy
(n): a fool person,
(adj): stupid, foolish, silly
The verb "have" in the phrase should be conjugated according to its tense in the sentence including it.