Top Definition
A fungus that bakers use to make their bread rise.

A fungus that infects womens' vaginas, causing them to produce a cottage cheese-like substance.
The bakery was unable to produce enough bread because of a shortage of baker's yeast.

I ain't gonna fuck my girl coz she's got a yeast infection.
po shdaf09ewrwe Фабруар 17, 2003
small, single-celled fungi of the phylum Ascomycota that reproduce by fission and are capable of fermenting carbohydrates into alcohol and carbon dioxide (Webster's).
I baked the bread and waited for the yeast to rise.
How does not using toilet paper make you a slut?
po red dragon Јул 17, 2003
An emphatic word that can be used as an insult or an adjective.
-You stupid yeast!

-That person sure was yeasty.
po BRINBE Август 5, 2004
1. Something/someone very big or fat.
2. feeling of extreme laziness.
1. Look at that girl, what a yeast.
2. Man, i feel like such a yeast today.
po Fatkunt Октобар 19, 2010
when one is harboring yeast cultures in their twat. I hear yogurt is good for curing such infections. If you don't get these infections checked out it may lead to greater trouble.

Yeast cultures make me itchy.
po sf9999 Фабруар 1, 2009
Verb. To "yeast" somebody is to have sexual intercourse with said person while having a yeast infection. Recently this has become a mainstream fetish for Asians all across the world. Have you been yeasted?
Asian Girl: Want to yeast?

Asian Guy: Sure, I hear it's a new mainstream fetish.
po Credit Јул 8, 2010
Meaning "Yes", in a maniacle way, and usually lasts multiple seconds. Commonly combined with a villiany hand-sanitizing motion.
Emily: Are we going to the mall to go bow shopping on Saturday?
Dave: Yeast Emily...
po jonathonbeuregardperiwinkle Август 27, 2011

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