To be crazy; to act, think, or behave in an eccentric, foolish, or nonsensical manner. Primarily heard in Australia. Tommy must have a few kangaroos loose 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 a few kangaroos loose in the top paddock.