Nick signs his name on the back of the envelope and starts a conflict with the frindle business.
This is Nick and he is very childish.
Invent your own word
Always stick to your word.
Somebody as in Nick wanted to have the envelope and wanted to know what was inside it. But Mrs. Granger told him he will know when to get the envelope.So ten years later he receives a package at the front door of his apartment. Then he sees a envelope, a note, and a dictionary and opens the envelope and sees a note from Mrs. Granger.
The word is papsap. It means to kick something hard. I chose it because I kick stuff a lot.