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2.
nasty, smelly, pussy. pussy that has an odor similar to that of old tuna fish, or pussy that is very hairy and unmanicured
I took sarah home last night and had that bitch butt-ass naked, but i soon ended dat shit after i saw that fat, stanky, gorilla yainch
by Xenos Llyod Clarke February 16, 2010
 
1.
Used to describe someone that is very unpleasant. An extremely disliked person.
Bruce is such a yainch!
All Norm does is yainch all day.
by The Rhino November 04, 2005