Top Definition
A baby mama's mama that is grandpaing baby mama sweet child.
Thats big grandma but don't tell little daddy
by BigMamaSweetAss October 31, 2007
"Big grandma" is one of your two grandmothers who is the elder one. Big grandma could also be the great-grandmother.

(Think of it like "big brother; big sister" bigger as in older.)
My "big grandma" is my great-grandmother and she's older than my grandma.
by StrawberryRedHead July 29, 2011
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