Final answer:
The phrase "who-who-what-what" does not have a clear or standard meaning in English and is likely used for effect or to signify confusion. It could potentially be part of a tongue-twister or a playful sound mimicry.
Step-by-step explanation:
The phrase "who-who-what-what" in English is not a standard phrase with a well-defined meaning. It appears to be a nonsensical repetition of question words likely used for either comedic effect, as part of a tongue-twister, or in a context where someone is confused or seeking clarification on several points simultaneously. This string of words may be employed in creative writing, casual speech, or in situations where an individual is playfully mimicking the sound of an owl's hooting ("who who") followed by the word "what", possibly indicating a questioning or puzzled state.
If this phrase is encountered in literature, it would require additional context to determine its proper meaning. English is full of idiomatic expressions, but "who-who-what-what" does not belong to this category unless it has been used with a specific meaning in a localized or cultural context. As a tutor, I would advise the student to look at the surrounding text or dialogue where the phrase appears to discern its meaning in that particular instance.