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To waste or use up something recklessly, carelessly, or foolishly. A noun or pronoun can be used between "piddle" and "away." He piddled away his entire inheritance on drugs, gambling, and sports cars. We can't piddle our time away if we want to get this finished by the deadline!
piddle something away
Fig. to waste away money or a period of time. Please don't piddle all your money away. Jane piddled away most of the day.