Wiktionary
threepenny bit
alt. 1 (context countable historical English) A former (pre-decimalisation) British coin worth three old penny. 2 (context Cockney rhyming slang English) A woman's breast; a tit. n. 1 (context countable historical English) A former (pre-decimalisation) British coin worth three old penny. 2 (context Cockney rhyming slang English) A woman's breast; a tit.
Usage examples of "threepenny bit".
I'll let you have this (producing a beastly little threepenny bit with a hole in it which he had probably picked up in the street) until I can pay you back.