Top Definition
A famous ski resort in Hokkaido Japan that is very flat.
Known to punters who flock there for the deep powder snow as 'Niseko'
Australian skier one: Hey guess what? I'm going to Niseko in January!
Wise Australian skier two: Flatseko? why not go to Nagano instead?
by Phantom Ninja December 15, 2008
5 Words related to flatseko

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