The act of stealing food from one who is sleeping. Can also include other items such as T.V. remotes, newspapers and money.
Having fallen asleep on the train Wendy awoke to find her mcmuffin and newspaper had been stolen. She was a victim of slumberplunder.
Wendy- Yawn…Hey where have my Doritos gone?
Jeff- I finished them off whilst you were asleep.
Wendy- That’s so slumberplunder!