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11.
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...
by jonathonbeuregardperiwinkle August 27, 2011
 
1.
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 17, 2003
 
2.
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 17, 2003
 
3.
An emphatic word that can be used as an insult or an adjective.
-You stupid yeast!

-That person sure was yeasty.
by BRINBE August 05, 2004
 
4.
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.
by Fatkunt October 19, 2010
 
5.
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.
by sf9999 February 01, 2009
 
6.
Yeast is a bodily substance of which a wild creature called the "Poul" enjoys running through his teeth. Pouls have been known to baths in the substance. The Pouls have a high concentration of yeast in their vaginas so that they will never run out of yeast.
Friend:Woah, look at that poul.
The wild Poul: yeasty is for feasty!
by Imabossassbitch(max3) December 07, 2013
 
7.
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.
NOUN
dialouge:
Person 1: "hey! check out that person over there"
Person 2: "oh man... YEAST!!!"

ADJ
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*
YEAST!
by unclekevin.* May 07, 2008