Can you derive a whole system of measurements from that?
We've got length.
Time is presumably the time taken for a reindeer to empty its bladder, so around 21 seconds.
Quantity, just count out the water molecules in a bladder's worth of urine.
Temperature, based on the body temperature of a reindeer and the freezing point of urine.
Mass of a standard bladder's worth at body temperature.
Electric current and luminous intensity could be tricky...