* Something increases rapidly and unexpectedly. The "shooting up" part suggests a sudden and forceful rise.
* There's a hidden or unexpected element involved. The "rock in the answer" implies that there's something hard or difficult to deal with that wasn't initially apparent.
Example:
"The stock market shot up suddenly with rock in the answer. We all thought the economy was doing well, but then the news about the trade war hit."
In this example:
* "Shot up suddenly" refers to the sudden increase in stock prices.
* "Rock in the answer" represents the unexpected news about the trade war, which negatively impacted the economy and could lead to market instability.
Without more context, it's difficult to give a precise definition.