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To exhaust or deplete some resource in a wasteful, careless, or irresponsible manner. A noun or pronoun can be used between "trifle" and "away." You'll never afford a house if you keep trifling your money away on such useless extravagances. With this shallow, stupid sequel, the film studio has trifled away a lot of the goodwill they created among fans of the franchise. She had plenty of time to complete her essay, but she trifled her time away.
trifle something away (on someone or something)
to waste something, such as money, on someone or something, little by little. Don't trifle all your money away on your friends. Don't trifle away any more money on silly purchases.