Top Definition
A woman who bore a child or children long past the normal human female reproductive age through the help of science. Though she presumably made the decision with high hopes the success of the resulting outcome is often doubted by both the fossil mom as well as the kid(s). Sometimes, though not necessarily, seen in the company of a fossil dad.
The fossil mom looked forward to collecting social security to help pay her son's college tuition.
by Awnlooker May 14, 2010
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