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A double yolker is an egg (usually a chicken egg) which has two yolks. Triple yolkers are rarer but not unheard of. Since the yolk is the site of the embryo in a fertilized egg, this occurrence is roughly analogous to fraternal twins or triplets in a human pregnancy.

Double yolkers are usually large or extra-large size eggs, produced by young chickens whose egg-laying cycles are not fully synchronized. They can also result from a diet over-rich in nutrients, since a chicken who thinks times are good might try to create more offspring than usual. Then again, some chickens just seem to produce double yolkers their whole lives.

some info from: http://www.goldenvalley.com/faq.html

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