“Island juice” sounds like something that comes in a glass with umbrellas and is sold for exorbitant amounts of money to the trendies !
I say “in-sh-lin”. I tried to think of it as “Sugar Killer” but found that it made me start singing “psycho killer” (Talking Heads) but with sugar as the first word.
Maybe “hyper killer” ? but that still leads back to the same song !