from Wiktionary, Creative Commons Attribution/Share-Alike License.
superlativeform of fizzy: most fizzy.
Sorry, no etymologies found.
That's especially clear in this marvelous little three-song set at the NPR Music offices: With only Evan Cranley's acoustic guitar for accompaniment, Millan and Campbell take two of the fizziest dance-pop tracks on
These bath bombs are the fizziest bombs I have ever made.
You're not the fizziest drink in the fridge are you?!