Vocab in Shrimp

The vocabulary in the book "Shrimp" is unlike some vocabulary you would normally see like when it say "Having Shrimp and his mellow vibe permeating our house is like having Paxil dosed through the central heating ducts" (Cohn 103). In this quote the word permeating, me not knowing what it means, I looked it up and the Google definition was spread throughout (something); pervade. Some other vocabulary would be when it says “I was left with no choice but to exercise my Big Sister prerogative. “SCRAM!” I yelled, and they were outta there” (Cohn 106). Using this quote the word prerogative is unfamiliar to me, so when I looked up the definition and the meaning of prerogative is a right or privilege exclusive to a particular individual or class. The vocabulary of this book can and can’t be elevated or maybe even low, this story has a combination of both.