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Typically a "stiff" drink contains less mixers than alcohol. As a result a stiff drink is generally stronger, or stronger tasting.
A Sex on the Beach cocktail for example has 1 part peach schnapps, 2 parts cranberry juice, and 2 parts orange juice to only 1 part vodka. That isn't a stiff drink, but a shot of whiskey straight would be.
by FurrowedBrow October 17, 2010