Now everybody say
I am the best rapper alive
I am the best rapper alive
And I will eat you alive; think I'm lyin?

from Lil Wayne – Let The Beat Build Lyrics on Rap Genius

Meaning

When Tha Carter 3 was released, Wayne was being praised as the best rapper alive (even KRS-ONE said so).This obviously gave him more confidence than he originally had, so he thought he would be able to defeat any rapper, concerning anything. When he said he would beat a rapper, he meant it.

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