Actually, you dig, I'll mac milli your wig
I'm black William Bonnie, that's Billy the Kid

from Crooked I – Boom Boom Clap Lyrics on Rap Genius

Meaning

Crook draws a neat historical parallel here, comparing his propensity to shoot you (probably with his 9mm MAC-10 sub machine gun, known as a Mac Milli) to another famous shooter from history, legendary outlaw William H. Bonney, a.k.a. Billy the Kid

In addition to Crooked, many other musicians have compared themselves to the 19th century bad-ass, including noted gangsta Billy Joel

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