I can get iller than 'Nam,
“Ill” can mean 2 things:
Acting stupid. Perfectly explained in the song by Run-D.M.C., “You be Ill'n”
Something crazy, extraordinary, or over-the-top.
Rakim compares his rhymes to the unbelievable destruction/murder of the Vietnam War, getting both crazier and more intense than the infamous battles.
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