"Chassis" is slang for a woman's body, especially her genitalia.
A childhood belief about general

others believed things like this
- When I was a kid I thought rape just meant someone tearing the clothes off of a woman's body.— Matt
- I used to think Cockneys only ever talked in rhyming slang.Anon
- For whatever reason, I thought that grass was slang for tobacco rather than marijuana.Anon
- I used to think that "extra body" shampoo meant you could use the runoff suds to clean your body.— Christy
- My sister just recently realized that the lyric "more than a woman" wasn't 4 letter woman!— Anne
- I thought the line in the song "more than a woman" was "four-legged woman".— boo