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A mocking name for Ninja Gaiden, or just an alternate way of pronouncing the name, used by people who are either very bad at Ninja Gaiden or don't know how to pronounce Japanese words.
"I hate Ninja Gayden! It's such a waste of time."

"That's what you say about all games that you're bad at. You said the same thing about Touhou!"
by Kaymac August 24, 2010