Gambino stay fly. So up, I'm Pixar

from Childish Gambino – For Your Love (Freestyle) Lyrics on Rap Genius

Meaning

Gambino is ‘fly’, which means that he’s good at rapping, desirable, and girls want him. This line references Pixar’s 2009 hit movie, ‘up’, because it is about a flying house.
Basically, Glover is calling himself as fly as a floating house, pretty damn fly.

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