Выражение встречается в следующем контексте:Winter's city side
Crystal bits of snowflakes all around my head and in the wind
I had no illusions
That I'd ever find a glimpse of summer's heat waves in your eyes
You did what you did to me, now it's history I see
Here's my comeback on the road again
Things will happen while they can
I will wait here for my man tonight, it's easy when you're big in Japan
You're big in Japan , you're big in Japan
You're big in Japan, it's here
You're big in Japan and I sleep by your side all through the night
Big in Japan, it's easy to be

Neon on my skin
Passing silhouettes of strange illuminated mannequins
Shall I stay here at the zoo
Should I go and change my point of view for other ugly scenes
You did what you did to me, now it's history I see...
Things will happen while they can
I will wait here for my man tonight, it's easy when you're big in Japan

You're big in Japan , you're big in Japan
You're big in Japan, it's here
You're big in Japan and I sleep by your side all through the night
Big in Japan, it's easy to be

Заранее спасибо

http://www.thestranger.com/seattle/Content?oid=9622&mode=print
What does it mean to be big in Japan? It means that for some reason your own country has passed you over, either for being too marginalized, not marginalized enough, too done, too rare. And something in this not-quite-right-for-mainstream status translates into deep interest somewhere else, either for reasons of exoticism (a kind of reverse Orientalism) or an uncanny and unexpected bridge to another culture.

то есть косвенно - пришелся не ко двору, нет пророка в своем отчестве и т.п.?

вроде как "молодец среди овец", в Японии популярен.. а попробуй-ка завоевать более искушенного слушателя..

такое предположение