What does "flush" mean in this sentence?

[English_holic]

English Language Tests, Intermediate level

ESL/EFL Test #313 "English Slang Idioms (34)", question 1

"That car I was going to buy turned out to be a ......... flush. The owner didn't put this in the advertisement but the car needs over two thousand dollars in repairs," Curt said to Dina.

(a) straight
(b) radiator
(c) busted
(d) toilet

English Language Tests, Intermediate level

ESL/EFL Test #313 "English Slang Idioms (34)", answer 1

"That car I was going to buy turned out to be a busted flush. The owner didn't put this in the advertisement but the car needs over two thousand dollars in repairs," Curt said to Dina.

Correct answer: (c) busted

Your answer was: ?
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Hi
What does "flush" mean in this sentence?
Thanks,

Englishholic

[Mister Micawber]

.
Here, a 'flush' is a hand of 5 playing cards in poker that are all of one suit (diamonds, spades, etc). A 'busted flush' in poker is 4 cards of one suit, and one card that does not match them.
.
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Native English teacher at Mister Micawber's

[Sophie]

So I want to know what does the whole sentence mean?
Thanks.
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On earth there is nothing great but man, in man there is nothing great but mind.

[Lost_Soul]

He was going to buy a car that was in bad condition.

[Dredmour]

Yeah it's funny, the joke is related with a poker card game hand suit named flush, but in this case it's "busted" because you has no flush in your hand just 4 cards with the same suit. Making sense when you think you made a good choice in any business but in reality you didn't. Too close but, not this time baby!!!!

[Sophie]

Nice to meet you here, Dredmour! You seem to be very good at English!
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On earth there is nothing great but man, in man there is nothing great but mind.

[Wjh678]

I was thinking that in the poker game a flush is one of the bigger hands. It is good fortune to get one. So maybe the guy was thinking he had a good deal, but it turned out to be not so. So his hope went down the toilet. Too much thinking.