A "Bob" refers to the British nickname for a 1 shilling (5 pence) coin; thereby "Ten Bob" is a 50 pence coin. (Archaic: there was previously a Ten Bob Note)

Mostly used in South Yorkshire, England, a "Ten Bob Millionaire" is a derogatory term someone who dresses and acts like they have a lot of money and status when in fact they have very little (i.e. Ten Bob)

They buy things to make themselves look more important than they actually are. They act like they are important and have a very high opinion of themselves, while deeming other to be below them and beneath contempt.
"Look at him with his posh suit and catching a bus. Another ten bob millionaire!"

"She's all fur coat and no knickers; just a ten bob millionaire!"
by Beowyn June 25, 2014
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Someone who drives a Caddy, but cannot make the payments. Someone who has a new Lexus but lives in a trailor park. Someone who wears fashionable labels, but cannot afford lunch. Someone who just got their paycheck and is spending it to impress rather than paying their bills.
Example: Wow, two thousand dollar rims on a four hundred dollar car, he must be a "ten bob millionaire"
by mrs_heffner February 10, 2011
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