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1847, of unknown origin, perhaps an alteration of trifle, by influence of piddle, etc. Or perhaps imitative of a puff of air, with a diminutive suffix. As a noun by 1890.
A mild exclamation of disbelief, contradiction, rejection, etc (1914+)
Nonsense; baloney, bunk: the kind of piffle actors have to go up against (1890+)