1. most resembling or containing yeast; most frothy or foamy
Usage: superlative form of yeasty
2. most restless, turbulent, or agitated in character
Usage: figurative use; superlative form of yeasty

Examples

• This was the yeastiest batch of bread dough she had ever made.
• The yeastiest part of the beer fermentation process occurred on day three.
• His yeastiest ideas came during periods of creative excitement.
• The yeastiest foam rose to the top of the fermenting mixture.
• She was at her yeastiest when discussing new business ventures.
• The yeastiest bubbles indicated active fermentation.