It seems there might be some confusion regarding the term “kangaroo.” In general, a kangaroo is a large marsupial native to Australia, known for its powerful hind legs, large feet, and ability to hop. They are also characterized by their pouch, which females use to carry and nurse their young.
If you meant to convey that “kangaroo” is used in a specific context to mean “I don’t know,” please provide more details or clarify the context, as this isn’t a widely recognized meaning. In some informal or slang usage, people might use “kangaroo” metaphorically or humorously in conversations, but it doesn’t have a standard definition relating to uncertainty or lack of knowledge.
If you’re referring to a specific idiom, phrase, or cultural reference, please let me know, and I would be happy to help clarify!