Ya'll know what I'm a let on

from Lupe Fiasco (Ft. MDMA) – I Don't Wanna Care Right Now Lyrics on Rap Genius

Meaning

Let on — letting people know. Lupe is letting on, letting us know just how good a lyricist he is (if you didn’t know already).

Some people here the line as:
“Y'all know I’m the little homie Lupe, yes sir, who they?”

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