Watch for Sheila’s “chitty” — Cockney rhyming slang. It’s called the “chitty” because the last part of “chitty chitty bang bang” rhymes with “slang”. Sheila got it from her parents, who emigrated to Australia before she was born. “Listerine” is an antiseptic, which links back to “septic tank” — rhyme for “Yank”. As for “pony and trap”… I’ll let you guess what “trap” rhymes with.