American Heritage Dictionary
(1)
Century Dictionary
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
Asking the foreign guy to make pachinko was definitely out of left field.— Siliconera
That said, there's a lot of people who are interested in Japan, and have wondered what pachinko is all about.— Siliconera
Peggle plays as a cross between pinball and pachinko - your goal is to make pegs disappear by hitting them with steel ball shot from a cannon at the top of the screen.— Macworld UK News
In the future of the future, an ancient civilization has sealed away its riches in elaborate temples dedicated to the game of pachinko.— GamerBytes

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You can expect to see this word about once a year.