This phrase came about after a Con-man by the man of George C. Parker sold the Brooklyn Bridge twice a week for 30 years.

LINK: https: // en.wikipedia.org/wiki/George_C._Parker
Person 1: Hey I hear the Earth is a Globe.

Person 2: OH Yeah? I have a bridge to sell you /I have a bridge, do you want to buy it?
by JohnnyReaper May 21, 2016
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A phrase of unknown origin which one would say to a person who believes something that is unbelievable.
Person 1:"Marijuana is illegal because it's bad for you."

Person 2: "If you believe that, I have a bridge to sell you."
by Scratch4416 September 14, 2013
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