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 4, 2008
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cheap (inexpensive) prostitute.(obs.) word from Victorian England. threepenny (thrup'ny) was the price, upright was the position (to facilitate speed, therefore rapid turnover of customers), "the deed" was frequently done in alleyways. Known use found in Bertolt Brecht's "The Beggar's Opera".
" 'es got the pox from seeing too many thrup'ny uprights" "A Lady?, Hell, she's naught but a threepenny upright."
by mike, PS1, USCG December 25, 2006
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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 3, 2011
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An item or person suspected of being counterfeit,fake or cheaply made.
As queer (odd) as a threepenny watch.
Also "three dollar bill"
by callandanswer December 25, 2007
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