But your letter's still under my sea like seaweed

from Lupe Fiasco – Say Something Lyrics on Rap Genius

Meaning

A play on the word “sea”. Lupe is now the letter C on the eye exam, while others are under the C, meaning they’re not on his level and can’t be seen

Also a play on the word “letters,” which sounds like “lettuce.” Sea lettuce is a type of seaweed

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