Source : Webster's Revised Unabridged Dictionary (1913)

Yeasty \Yeast"y\, a.
   Frothy; foamy; spumy, like yeast.

Source : WordNet®

yeasty
     adj 1: marked by spirited enjoyment [syn: {zestful}, {zesty}, {barmy}]
     2: exuberantly creative
     [also: {yeastiest}, {yeastier}]