I know your voice, man, you Marshall Lee, right?

from Childish Gambino – Think of Me Lyrics on Rap Genius

Meaning

Donald plays the voice of Marshall Lee on the Cartoon Network show Adventure Time

Featured on the gender-swap version of Adventure Time, Marshall Lee (Gambino) sang and rapped twice throughout the episode he was featured in.
Marshall Lee: Bad Little Rap
http://youtu.be/_fg8USvSEi0

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