It's an eye exam, you can't see B.

from Lil B – Can't See B Lyrics on Rap Genius

Meaning

“You can’t see B” refers to the saying “You can’t see me.” This phrase means that you’re literally not on Lil B’s level, in anything (rapping, being based, having a swagged out kitty, etc.)

Also, on the typical eye exam chart, there is no letter B, so you literally can’t see Lil B

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