Cause they rappin' like they Wayne
Rappin' like they Chainz

from Lupe Fiasco – SLR 2 Lyrics on Rap Genius

Meaning

Continuing on the previous few bars, Lu infers that inferior rappers think they’re hot because they rap like Lil Wayne or 2 Chainz, thus also implying Wayne & Chainz are subpar themselves.

Also notice, in a previous line he says “these new niggas rappin like they 2”. The 2 wordply can be seen as:

There’s also wordplay with wrapping like they’re chains/ rappin' like they Chainz.

Just before releasing SLR 2, Lupe tweeted rebuttals to Control in the style of different rappers including Wayne & Chainz:

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