Top Definition
Much like baby mama. Except, when used by the grandmother in the situation the baby mama would be called her "grandbaby mama".
For example:

My friend said her son and his girlfriend are having a baby. The girlfriend is going to be her grandbaby mama.

Instead of having baby mama drama, you may have grandbaby mama drama.
by A friend of Grandbaby Mama January 01, 2010

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