One of the more obscure messages of the Love Hearts candy, alongside 'True Lips'.
Granny P is the love heart you give to the person you dont actually want to give a love heart to but they keep pestering you for a piece of candy so you give them one.
Jake: Dude, Jenna looks well upset, what did you say?
Luke: Nothing, she kept bothering me for a love heart so I gave her the Granny P one.
Luke: It's what they were made for!