"Just kidding/It's a joke."
It's used to clarify that something said previously was meant humorously and not to be taken seriously.
Breakdown:
* Ka rin: This part emphasizes that the speaker is also including themselves in the joke, often implying that they understand the joke and are in on it.
* Joke lang: This is the core meaning, simply meaning "just a joke."
* Po: This is a polite marker that adds respect, indicating that the speaker is addressing someone older or of higher social status.
So, "ka rin joke lang po" is a way to add a touch of humor and soften a potentially awkward situation.