Grandma Nuts 

Yes, infact grandmas do have nuts

dude you smell like "grandma nuts"

Grandma Nuts by Isamsmart November 3, 2019

grandpa nuts

When your testicals sag unusually low for extended periods of time resulting in discomfort or pain.

Ex: I couldnt sleep last night cuz my grandpa nuts kept gettin tangled up in my boxers.

grandpa nuts by Dnewmanson October 7, 2016