Yeah bitch I'm heavy metalling
You can get the fucking Led Zeppelin

from Lil Wayne – I'm Me Lyrics on Rap Genius

Meaning

Weezy’s enemies can get the led (lead) zeppelin, bullets, from his heavy metal, gun.

Led Zeppelin is also widely considered one of the greatest Metal bands ever (Rolling Stone has them at #8). Wayne is comparing his greatness in rap to Led Zeppelin’s in metal.

Even more meaning: Lead (same pronunciation as “Led”) is a metallic element that is very dense and heavy.

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