An extremely personal insult that will mentally destroy a person it is used on. This insult stems from something held dear to the person, and is different for everyone.
“I was done dealing with Kevin, so I grandma stickered him. He never saw it coming”
The roast to end someone’s existence, usually related to a subject that the person is self-conscious about. Reserved for the most heated of arguments due to the often dire consequences of using the grandma sticker.
“I had enough of his shit, so I hit him with the grandmasticker. He hasn’t talked to me since”