Answer:
The author's grandma mean in lines 8-9 is that the grandfather was going to say a lie.
Step-by-step explanation:
This question refers to the text Story Tales by Jackie Torrence.
This story begins with the description of a grandfather who liked to tell scary stories. No matter what, every time someone asked him, Grandpa would tell his story.
But when he did, his wife would say "Hold it, let me leave the room, lightning's going to strike" because she believed that the stories her husband told were lies.