I don't front, no fabricate. I get high, I gravitate

from Lil Wayne – Racks on Racks Lyrics on Rap Genius

Simply put, Weezy doesn’t come up with lies in his bars

Front = act fake
Fabricate = to invent or manufacture something

To gravitate is to move toward or be attracted to a place, person, or thing. in this case, when Wayne smokes, he goes into orbit.

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