n breasts: She was a bit dull but what a cracking pair of thrupney bits! From Cockney rhyming slang “thrupney bits” / “tits.” The thrupney bit was once a three-pence coin but is no longer in circulation. Although I’ve been doing my best to avoid putting plurals into this piece of work, I have a lot of trouble trying to think of any situation in which you would ever refer to a single thrupney bit. Perhaps someday the terms “thrupney bit implants” or “thrupney bit cancer” will be commonplace, but they aren’t now.