Wash a nigga away or dock a nigga pay
I bring it back to the piers
And if you ready for that, you've just received the deadliest catch
That you've seen in years

from Lupe Fiasco – SLR 3 (Round of Applause) Lyrics on Rap Genius

Meaning

These lines are extended puns. If you step to Lupe, he’ll either:

1) wash you away/wipe you out, or

2) dock your pay/wipe your funds out.

There’s a water metaphor here (wash/dock), and it continues into the next two lines. If you think you’re ready for his onslaught, you just received the “deadliest catch,” as in you have no idea what you’re in for.

Deadliest Catch is a TV series on Discovery Channel chronicling fishermen’s harrowing jobs out at sea and rough experiences.

“I bring it back to the piers” is also a play on words, since Lupe brings it back to the “peers”. By bringing it back to the “piers,” Lupe is landing the catch, in other words getting paid in full (which contrasts with getting your pay docked).

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