Ill

From Rap Dictionary

adjective

ill

1. Negative.
2. Positive. Most illinest b-boys -- Beastie Boys (Rhymin' and Stealing [1986]).
3. Drunk. Bored as hell and I wanna get ill -- Eazy-E (Boys in Tha Hood).

verb

ill

To be obnoxious, or to act weird by accident, as in eating dogfood. You be illin' -- Run-DMC (You Be Illin' [1986]).