A fork of Rural Dictionary
Something special that should only be had or should only happen infrequently.
You can only have grandma's special home-made cookies a few times a year, and only for a small portion of your life until she passes.
"She only curls her hair a few times a year to keep the grandma's cookies effect."
Dank weed distributed by old folks
gimme some o dem grandma cookies
To paint one's penis green and then put cookies in their grandmas ass, and then put the penis in the ass.
Her: How was the family reunion?
Him: It was a total Green Penis Grandma Cookie!
Her: Holy FUCK!!