A feat of ingenuity performed by a Native American, typically to remedy a problem using only the tools or resources commonly found on an Indian Reserve.
I was driving past the rez and I saw a couple of Indians on the side of the road using a turned-over shopping cart as a barbecue grill. Textbook Indianuity.
Cleverly-sneaky methods utilized by disrespecters of Native Americans in da hope of bilking them out of their lands, resources, etc.
Fro whatever reasons (opinions vary as to da causes), People of the Red Path are viewed as being especially susceptible to da effects of alcohol, and so it doesn't really take all dat much injunuity to surmise dat they can be persuaded to do what you want if you ply them with enough "fire-water".
When some resigns or retires from a job, they are on "eternity leave". This can also refer to someone who has passed away, especially someone who worked somewhere for a long time, retired/resigned, then passed away later.
Oh I'm sorry, you didn't know that Kelly is on eternity leave? She resigned and moved to Hawaii!
With regrets I would like to inform you that my boss is officially on eternity leave. I will never see or hear them again. Ever.