The Collaborative International Dictionary of English v.0.48:

fizzing \fizzing\ fizzy \fizzy\adj.
   Hissing and bubbling, like a carbonated beverage.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

fizzy
    adj 1: hissing and bubbling [syn: fizzing, fizzy]

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "fizzy":
   beaten, blebby, blistered, blistering, blistery, bubbling, bubbly,
   burbling, burbly, carbonated, chiffon, ebullient, effervescent,
   puffed, souffle, souffleed, sparkling, spumescent, vesicant,
   vesicated, vesicatory, vesicular, whipped