He pūhi ka iʻa ʻoni i ka lani.
“The eel is a fish that moves skyward.”
Niuloahiki, a god of coconut trees, had three forms — eel, man and coconut tree, which reaches skyward. This expression can refer to Niuloahiki or to any influence that rises and becomes overwhelming. When used in hana aloha sorcery, it means that the squirming of love is like the movement of an eel. Also used in warning — “Beware of that ambitious person who will let nothing stand in his way.”
Source: ‘Ōlelo Noʻeau, by Mary Kawena Pukui