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Similar to a Surrogate, this is the female that was not intially good enough to have a mans child, but because she is so expendable, she is now used as a spare part to conceive a child.
The chick i wanted to be my baby mama aint havin it, some im bout to hit up Tonya, she gon be my spare-agate baby mama...
by TJ Goats December 23, 2011
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