Cranked it up to 11

I did a test, and the screen then said, “Cranked it up to 11.” What does that mean?

I googled it and found this:

Okeh, so it’s just saying my answer is correct. What a confusing way to do so! Thanks for the almost instantaneous help.

there are a lot of flashy sentences in the modal that appear after you pass the tests, it’s to insert some gaming aspect and pop references

it’s the big checkmark that says you passed it