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.
To do domething based on your emotions rather than for rational reasons
I can't believe that Tom beat his classmate. He's always the one who let his heart rule his head.