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the acronym for Urine Flow Unit. pronounced by the letters: 'yoo-eff-yoo.' a measure to describe the rate of liquid flow. one Urine Flow Unit, or UFU, is equivalent to the rate of a normal, unhurried piss. a full bladder may dispense urine in excess of one (1) UFU. the utility of the Urine Flow Unit is not restricted to bodily fluid, but indeed any flow of beverage, water, or other liquid. UFU is an American standard measure. To convert to metric, multiply by 1.54.
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