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3.
Cockney rhyming slang for "shit"
"I ate bad food and got a terrible case of the threepenny bits"
by callandanswer December 24, 2007
 
1.
Threepenny Bit are a traditional folk band based in Southampton. They are famous for having a drum kit made out of bits and pieces, and busking in the streets of Hampshire on a daily basis.
Did you see that band on the street in the rain today busking? That be Threepenny Bit.
by nichols31290 November 03, 2011
 
2.
Very old rhyming slang for tits - has been used since the 18th Century in the UK.
"Look at the threepenny bits on that chick - they're popping out, man"

"I shot my wad all over her threepennys..."
by Real cool trader April 04, 2008