Top Definition
One Invitro fertization procedure entails inserting a five day old embryo (Blastocyst) with a fancy turkey baster into the womb of a prospective mama. When the hopeful mama arrives home she tells her other children that they are going to be getting a Blastosis.
Mama sez our Blastosis is going to look like Lindsay Lohan.
by Mr. Chips April 20, 2006

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