It is a word often used in Colombia (is considered a colombianismo). Means inevitable, that you can not miss, without fail, irreplaceable, safe, clear, fixed, certain, infallible, firm.
Said is the Localism or barbarism / chilenismo referred to " you cannot or you must fail ": is impajaritable the guests attending. Concerned chilenismo a: secured, safe, inevitable, that does not fail, irreplaceable.