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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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Jul 11 Word of the Day
selfish idiots in my neighborhood who think that they don't need to wear a mask because the rest of us do
A maskhole jogged right past me in the park today
by Bethinslope May 11, 2020
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