Fiend

From Rap Dictionary

verb

fiend

1. To be hostile to.
2. To need something badly, most often drugs. But you can also be a fiend for a dope beat. I get a craving like I fiend for nicotine -- Eric B. and Rakim (Microphone Fiend) [1]
3. Obsession

noun

fiend

Someone who fiends. Says the boy to the fiend: 'What do you mean?' -- Muggs featuring Wyclef Jean (John 3:16) [2]