Grandbaby Mama 

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.

Grandbaby Mama by A friend of Grandbaby Mama January 1, 2010

grandbastard 

An illegitimate grandchild.

Sarah Palin has five children, one grandchild and one grandbastard.

grandbastard by Lârry Dângüs, esq. August 27, 2013

Grandayy 

The meme god that is better than Dolan Dark.All of our people should praise this chosen lad.

Look the top shagger Grandayy is coming.

Grandayy by A fellow Lad August 13, 2018

Grandayy 

Normie, makes memes on youtube.

Damn normie: *posts a grandayy meme*
Everyone: go away

Grandayy by ohokiguess November 21, 2018

grand baby 

Name for a grandchild of less discerning Grand parents or Grand peoples if you will..

I axed my Baby momma Where the money go i gave you for pampers for my grand baby?

grand baby by Respect 18 January 1, 2017

Grandayy 

Grandayy is the meme lord who beat Dolan Dark. He makes new memes unlike Dolan who makes dead memes.

Grandayy is the best YouTuber ever!

Grandayy by ADEEPOCEAN May 18, 2020

Grandayy 

Grandayy is the meme lord who beat Dolan Dark and makes the best memes in the world.

Person: Do you know Grandayy the noob
Grandayy Fan: *shows video*
Person: I was wrong

Grandayy is the best memester.

Grandayy by Mr Adeep September 17, 2020