One Flew Over The Cuckoo's Nest quote help?

Question

What are some elements and analysis behind this quote?

“So she really lets herself go and her painted smile twists, stretches to an open snarl, and she blows up bigger and bigger, big as a tractor, so big I can smell the machinery inside the way you smell a motor pulling too big a load.”

Answer 1

I dont' know. it sounds really complicated. try sparknotes or something