Silly gooses are people who do silly shenanigans. When you see someone doing something silly you can say they are a silly goose
person 1: did you see how she fell?
person 2: yeah she is such a silly goose
You're a fucking Re****
Jack: "He threw water on a grease fire"
Spencer: "What a silly goose"
emerson aka emmy aka best developer aka my emmy aka my favorite silly goose <3
When your friend is being quite silly you can call them a silly goose
Astrid, you silly goose - random teacher I overheard in the hallway once