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.
by shdaf09ewrwe February 18, 2003
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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?
by red dragon July 18, 2003
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An emphatic word that can be used as an insult or an adjective.
-You stupid yeast!

-That person sure was yeasty.
by BRINBE August 6, 2004
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A vaginal infection due to lack of female hygeine and excessive slutage.
The slut never used toilet paper and developed a yeast infection.
by Sarah April 6, 2003
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An term used to insult and describe a really ugly looking person, comes from the blending of the lexemes "beast" and "yeti" and means UGLY! or DOG!
Can be used as a noun or as an adjective.
Person 1: "hey! check out that person over there"
Person 2: "oh man... YEAST!!!"

Person 1: "ey bro did ya see that chick i was danc'in wif in da club?"
Person 2: "fuk bro.. she was yeast"

*ugly person walks past*
by unclekevin.* May 7, 2008
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n. The resulting gunk that forms in a pussy when the girl screws too many guys, or wipes her ass back to front.
Tiny Tina couldn't remember not to wipe her butt front to back so she became a factory of yeast.
by Sallys March 23, 2006
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