The phrase "What does that even mean?" is not equivalent to "What else does that mean?". Here's the difference:
"What does that even mean?"
This is a rhetorical or genuine question used to express confusion, disbelief, or skepticism about a statement or concept. The word "even" adds emphasis, showing that the speaker finds the statement particularly unclear or surprising.
Example:
Person A: "Time is just a flat circle."
Person B: "What does that even mean?"
"What else does that mean?"
This is a question asking for additional interpretations or meanings of a statement or word. It assumes there might be multiple meanings.
Example:
Person A: "Bark can refer to a dog's sound or the outer layer of a tree."
Person B: "What else does that mean?"
So, while "What does that even mean?" focuses on clarifying the current statement, "What else does that mean?" looks for alternative meanings.