Nothing like a poʻo huaʻi to generate today's word! Totally unrelated is the poʻo huaʻi lama or the splitting headache or hangover caused by liquor (lama = rum or any type of liquor). Poʻo is the Hawaiian word for head and huaʻi literally means to dig up, pour forth, break forth; to churn water. That pretty much describes a splitting headache well. Just like those ship propellers churning away in your head. Ouch. I'm not going to forget this word as long as this poʻo huaʻi lasts.
ʻEha kuʻu poʻo i ke poʻo huaʻi - My head is in pain with a splitting headache.