1. navel, navel string, umbilical cord.
2. summit or top of a hill or mountain, crest, crown of the head.
3. a common taro with many varieties.
There are many more meanings for piko, these above are just the more commonly known ones. Most common of them all is number 1 above. The navel. Pehea ko piko? How is your navel? This is used as a common question after saying aloha. Not always thought of as appropriate because figuratively piko refers to blood relatives and, lo and behold, the genitals. so pehea ko piko could be viewed as an inappropriate question by some (how's your genitals?). But, hey, it's all in the perception, right? Like so many things. But mostly, in poetic reference, it does refer to relatives and it is said that if one dreams of an injury to one's piko it is an omen of the death of a close relative. I would take it to mean that one of my close relatives got one of those piko rings. A bellybutton pierce. Ouch.I s that like taking a pin and poking it at a relative?
Ku'u ewe, ku'u piko, ku'u iwi, ku'u koko - my umbilical cord, my navel, my bones, my blood (said of a very close relative)
Mō ka piko - cut is the umbilical cord (a friendly relation between closely related persons has been severed)
Also, after women gave birth they would take the piko and hide it in certain crevices of rocks (I don't think that any rock would do since there are some areas/rocks well known for this practice) to ensure their baby's good health. If the piko was taken by a rat, then it was thought that the child would grow up to be a thief, much like a rat.
He piko pau 'iole - an umbilical cord taken by a rat (a chronic thief)
My babies' piko are all well taken care of, thank you very much. Don't want no thieves around!