1. n A beautiful sexy mom of a mom.
2. n Grandmother I'd like to fuck. Synonymous with Gilf.
3. n A great puma] in her fifties or sixties.
Steve: Hey, check her out. She might actually be a grandmilf!
You: You know Steve, you may be right!
A GrandMilf is simply a Mum I'de Love to Fuck, whos children have children.
I pulled what i thought to be a milf the other night who looked and acted like a porn star. after a couple of hours she told me she had grand children it was at this point in time I realised there were also GrandMilfs.