And on to Japan
Where they put major grands in my hand

from Hieroglyphics – You Never Knew Lyrics on Rap Genius

Meaning

Going on tour in Japan is notorious in any genre of music (including hip-hop) for grossing massive amounts of money in tour profit, thanks to the popularity of Western culture there (and particularly rebellious attitudes of Hip-hop and rock music)

you don’t have to be hot in the States at all to be “big in japan”

see phrase “Big in Japan”

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