So trill and so sincere
Yeah, I'm both them there

from Lupe Fiasco (Ft. Gemini) – Dumb it Down Lyrics on Rap Genius

Meaning

While trill (true + real) is somewhat of a synonym of sincere, it is a word often used in and associated with “ignorant” Southern type rap. Lupe is able to appeal to both those wanting to get hype and those wanting sincerity in the music.

It might also be a sly riff on Lupe’s own clothing line, called Trilly and Truly

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