Here are some possibilities, but without context, it's hard to be sure:
* A play on words: It could be a humorous reference to the rhinoceros, perhaps implying something forceful, large, or even aggressive.
* A specific action or activity: It might refer to a particular activity or behavior, perhaps related to a hobby, a sport, or a game.
* A unique slang term: It could be a local or regional slang term with a specific meaning.
To figure out the meaning, you'll need more information:
* Where did you hear it? Was it in a movie, a book, online, or in a conversation?
* Who said it? Knowing the speaker's background and the context of the conversation can be helpful.
* What was the surrounding conversation? The words around the phrase might give clues to its meaning.
If you can provide more context, I might be able to give you a more accurate answer.